A Geiger counter, measuring a radiation level of 0.442 microsievert per hour, is seen at a park in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 27, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 01 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Children bow to greet their nursery school teacher (R) as they get into a school bus heading to the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 02 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

A man uses a roller near a Geiger counter, measuring a radiation level of 0.207 microsievert per hour, during nuclear radiation decontamination work at a park in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 27, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 03 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

A girl runs past a geiger counter, measuring a radiation level of 0.122 microsievert per hour, upon her arrival at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 04 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Children play at an indoor playground facility in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 27, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 05 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Paper craft of Japanese ornamental "hina" dolls, made by children, are displayed on a wall at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 06 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Children play at an indoor sand pit of the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 07 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Children play at an indoor sand pit of the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 08 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

A girl opens the door of a teacher's staffroom at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 09 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Two-year-old Sakuya Zui plays at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 27, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 10 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

One-year-old Daichi Toyota plays with his mother at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 27, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 11 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Children play dodge ball in a playroom at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 12 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

A boy plays with a paper plane in a corridor at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 13 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Four-year-old Iori Hiyama rides a tricycle at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 27, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 14 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Two-year-old Nao Watanabe plays in a ball pit at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 27, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH TPX IMAGES OF THE DAY)

ATTENTION EDITORS: PICTURE 15 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Two-year-old Sakuya Zui plays at an indoor playground which was built for children and parents who refrain from playing outside because of concerns about nuclear radiation in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 27, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 16 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Children play dodge ball in a playroom at the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 17 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

A child walks past a geiger counter, measuring a radiation level of 0.162 microsievert per hour, at a square in front of Koriyama Station in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture March 1, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken March 1, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 18 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

A girl wearing a mask sits in a school bus heading to the Emporium kindergarten in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 19 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

A doctor conducts a thyroid examination on a five-year-old girl as her older brother and a nurse take care of her at a clinic in a temporary housing complex in Nihonmatsu, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 27, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 27, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH TPX IMAGES OF THE DAY)

ATTENTION EDITORS: PICTURE 20 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL SEARCH 'KORIYAMA HANAI' 

Five-year-old Atsunori Kaneta smiles at his home in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 21 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI' 

Seven-year-old Masyoshi Kaneta plays a Nintendo Wii U game in the living room of his home in Koriyama, west of the tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima prefecture February 28, 2014. March 11 marks the third anniversary of the earthquake and tsunami that devastated Japan's Fukushima Daiichi nuclear power plant. In Koriyama, a short drive from the crippled Fukushima nuclear plant, the city recommended shortly after the disaster that children up to two years old not spend more than 15 minutes outside each day. Those aged 3 to 5 should limit their outdoor time to 30 minutes or less. The limits were lifted last year, but many kindergartens and nursery schools continue to obey them even now in line with the wishes of worried parents. An annual survey by the Fukushima prefecture Board of Education found that children in Fukushima weighed more than the national average in virtually every age group. The cause seems to be a lack of exercise and outdoor activity. Picture taken February 28, 2014. REUTERS/Toru Hanai (JAPAN - Tags: DISASTER EDUCATION ENVIRONMENT HEALTH)

ATTENTION EDITORS: PICTURE 22 OF 22 FOR PACKAGE 'FUKUSHIMA - FIGHTING AN INVISIBLE ENEMY'. TO FIND ALL IMAGES SEARCH 'KORIYAMA HANAI'