Moldova's President Maia Sandu receives a dose of the AstraZeneca vaccine against the coronavirus disease (COVID-19) in Chisinau, Moldova May 7, 2021. REUTERS/Vladislav Culiomza 

Veterinarians prepare Tango, an eleven-year-old male jaguar, for a full medical examination at the Buenos Aires Zoo October 27, 2014. Argentina's rare jaguar was added to Buenos Aires Zoo's DNA bank on Monday as conservationists step up efforts to save the big cat species that is on the brink of extinction. The 11-year-old jaguar called Tango could be the key to preserving the species for future generations. At the zoo's Biotechnology Reproduction Lab, vets took blood, hair and semen samples from Tango to be stored. REUTERS/Enrique Marcarian (ARGENTINA - Tags: ANIMALS SOCIETY) 

An anti-government protester receives medical treatment inside Mikhailovsky Zlatoverkhy Cathedral (St. Michael's golden-domed cathedral) in Kiev early February 19, 2014. Ukrainian President Viktor Yanukovich warned his opponents on Wednesday that he could deploy force against them after what he called their attempt to "seize power" by means of "arson and murder". REUTERS/Maks Levin (UKRAINE - Tags: POLITICS CIVIL UNREST) 

Surgical Tech Melissa Ellis prepares an OR room in the University of Mississippi Medical Center in Jackson, Mississippi October 4, 2013. Mississippi is one of at least 20 states that has decided not to expand Medicaid under the Affordable Care Act, better known as "Obamacare". REUTERS/Jonathan Bachman (UNITED STATES - Tags: HEALTH POLITICS BUSINESS) 

Dr. Benjamin Warf (C) washes his hands before operating on the spine of four-year-old Emma Guarino to debulk an intraspinal lipoma and untether her spinal cord at Children's Hospital in Boston, Massachusetts May 14, 2013. Guarino suffers from spina bifida, a developmental congenital disorder caused by the incomplete closing of the embryonic neural tube. REUTERS/Brian Snyder (UNITED STATES - Tags: HEALTH) 

Dr. Benjamin Warf discusses images of the spine of four-year-old Emma Guarino before an operation to debulk an intraspinal lipoma and untether her spinal cord at Children's Hospital in Boston, Massachusetts May 14, 2013. Guarino suffers from spina bifida, a developmental congenital disorder caused by the incomplete closing of the embryonic neural tube. REUTERS/Brian Snyder (UNITED STATES - Tags: HEALTH) 

Dr. Benjamin Warf operates on the spine of four-year-old Emma Guarino to debulk an intraspinal lipoma and untether her spinal cord, at Children's Hospital in Boston, Massachusetts May 14, 2013. Guarino suffers from spina bifida, a developmental congenital disorder caused by the incomplete closing of the embryonic neural tube. REUTERS/Brian Snyder (UNITED STATES - Tags: HEALTH) 

A technician carries out a test on a suspected infected sample using the H7N9 bird flu virus test reagents at the centre for diseases control and prevention in Hefei, Anhui province April 5, 2013. Chinese authorities were slaughtering birds at a poultry market in the financial hub Shanghai as the death toll from a new strain of bird flu mounted to six on Friday, spreading concern overseas and sparking a sell-off on Hong Kong's share market. According to Xinhua News Agency, east China's Zhejiang Province on Friday morning reported that a man has died from the H7N9 bird flu, bringing the death toll from the new deadly strain to six in the country. REUTERS/Stringer (CHINA - Tags: HEALTH DISASTER ANIMALS) 

A doctor waits for a blood sample outside an isolation ward where a 67-year-old patient suffering from the H7N9 bird flu strain is being treated at a hospital in Hangzhou, Zhejiang province, April 4, 2013. China said it was mobilising resources nationwide to combat the new strain of the deadly bird flu that has killed four people, as Japan and Hong Kong stepped up vigilance against the virus and Vietnam banned imports of Chinese poultry. A total of 11 people in China have been confirmed to have contracted H7N9, all in the east of the country, while another person died on Thursday, in Shanghai, bringing the number of deaths to four, state media said. Authorities in Shanghai also discovered the H7N9 virus in a pigeon sample taken from a traditional wholesale market, Xinhua added, believed to be the first time the virus has been discovered in a animal in China since the outbreak began. REUTERS/Chance Chan (CHINA - Tags: DISASTER HEALTH) 

A breast cancer survivor poses for a photograph at a centre run by the "Reto" Group for Full Recovery of Breast Cancer in Mexico City October 18, 2012. Breast cancer has been the leading cause of death in Mexican women since 2006, according to the group. The World Day Against Breast Cancer is commemorated on October 19. REUTERS/Edgard Garrido (MEXICO - Tags: HEALTH ANNIVERSARY) 

Patients wait to receive anesthesia before undergoing surgeries to remove their cataracts at the Tilganga Eye Center in Kathmandu April 25, 2012. About 150,000 of Nepal's 26.6 million people are estimated to be blind in both eyes, most of them with cataracts. Picture taken April 25, 2012. REUTERS/Navesh Chitrakar (NEPAL - Tags: HEALTH SOCIETY POVERTY) 

Chabot College dental hygiene student Rimpi Walia performs a procedure on a patient during a free medical clinic organized by non-profit group Remote Area Medical at O.Co Coliseum in Oakland, California March 24, 2012. The four day free medical, dental, and optical clinic attracted thousands of attendees, often without insurance and unemployed, as well as hundreds of volunteer medical professionals. REUTERS/Stephen Lam (UNITED STATES - Tags: HEALTH SOCIETY POVERTY) 

A veterinarian sterilizes a monkey inside a monkey rescue centre run by forest and wildlife department Tutikandi in the northern Indian hill town of Shimla November 14, 2011. The Himachal Pradesh state government is offering a reward of 500 Indian Rupees ($9.50) for every monkey caught by a member of the public in an effort to control their numbers. Monkeys are increasingly seen as a nuisance in places like the capital Shimla, where they harass people and other animals on the roads and rifle through garbage bins looking for food. Monkeys caught are taken to one of four sterilization centres, where they are neutered before being released back into the same area they were trapped in. There were at least 317,000 monkeys in Himachal Pradesh according to the most recent survey of the primates, which was conducted in 2004-05. Picture taken November 14, 2011. REUTERS/Mukesh Gupta (INDIA - Tags: ANIMALS SOCIETY HEALTH) 

Doctors and medical staff work during knee prosthesis surgery in an operation room at the hospital of the Canton of Nidwalden in Stans, October 27, 2011. The hospital is the only one in Switzerland providing a ten year guarantee on knee and hip prosthesis surgeries. Picture taken October 27, 2011. REUTERS/Michael Buholzer (SWITZERLAND - Tags: HEALTH) 

Doctors and medical staff work during knee prosthesis surgery in an operation room at the hospital of the Canton of Nidwalden in Stans, October 27, 2011. The hospital is the only one in Switzerland providing a ten year guarantee on knee and hip prosthesis surgeries. Picture taken October 27, 2011. REUTERS/Michael Buholzer (SWITZERLAND - Tags: HEALTH) 

Carmen Arteaga, 28, gives birth inside the childbirth unit at hospital Escuela in Tegucigalpa October 21, 2011. According to Honduras' health authorities, about 220,000 babies are born in Honduras each year and the cost of having a baby delivered at the public hospital is $10. The world's population will reach seven billion on October 31, according to projections by the United Nations. Picture taken October 21, 2011. REUTERS/Edgard Garrido (HONDURAS - Tags: HEALTH SOCIETY) 

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Obstetrician Ana Lara carries baby Diego Alejandro born by caesarean in the private Aquamater clinic in Caracas September 10, 2011. Aquamater opened in 1999 and is the first centre specialising in waterbirths in Venezuela. It aims to advise couples, who pay a fee, on techniques for breastfeeding, pain relief and different ways of giving birth. The world's population will reach seven billion on 31 October 2011, according to projections by the United Nations. Picture taken September 10, 2011 REUTERS/Jorge Silva (VENEZUELA - Tags: HEALTH SOCIETY) 

Doctor Ji Jiafu (2nd R) operates with his staff on a cancer patient in an operating theatre in the Beijing Cancer Hospital July 12, 2011. Cancer is spreading in China and is one of the country's leading killers, with 2.1 million deaths annually. Researchers and pharmaceutical companies are trying to find ways to combat the country?s growing epidemic and seize shares of a promising gigantic market. Cancer is a leading cause of death around the world, with around 12.7 million people discovering they have cancer and 7.6 million people dieing from some form of the disease. REUTERS/David Gray (CHINA - Tags: SOCIETY HEALTH IMAGES OF THE DAY) 

A medical worker prepares an emergency medical reception point in an abandoned cafe near a checkpoint in Bir Ayyad July 1, 2011. Libyan rebels who had advanced to within 80 km (50 miles) of Muammar Gaddafi's stronghold in the capital were forced to retreat on Friday after coming under a barrage of rocket fire from government forces. REUTERS/Anis Mili (LIBYA - Tags: POLITICS CIVIL UNREST CONFLICT HEALTH) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Doctors operate on a rebel fighter, seriously injured by Gaddafi forces near the front-line, in a Ajdabiyah hospital April 14, 2011. REUTERS/Yannis Behrakis (LIBYA - Tags: CONFLICT MILITARY HEALTH) 

A technician uses a Geiger counter to screen a photographer for signs of nuclear radiation at a welfare center in Yamagata, northern Japan March 20, 2011, nine days after the devastating earthquake and tsunami. Japan made some progress on Sunday in its race to avert disaster at a nuclear power plant leaking radiation after an earthquake and tsunami that are estimated to have killed more than 15,000 people in one prefecture alone. REUTERS/Yuriko Nakao (JAPAN - Tags: DISASTER ENVIRONMENT ENERGY HEALTH) 

Mitsuo Watanabe, who evacuated from Iwaki, Fukushima, receives a screening test for nuclear radiation at a welfare center in Yamagata, northern Japan March 20, 2011, nine days after Japan's devastating earthquake and tsunami. REUTERS/Yuriko Nakao (JAPAN - Tags: DISASTER ENVIRONMENT) 

Anti-nuclear protesters demonstrate in front of the German Chancellery in Berlin, March 15, 2011. German Chancellor Angela Merkel meets heads of federal states to discuss safety of nuclear plants. The poster reads: 'Merkel (German Chancellor Angela Merkel) radiates us all. Change it!' REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS ENVIRONMENT) 

Nurse-anaesthesiologists stand on the tracks as they block the Montparnasse train station during a demonstration to protest hospital working conditions in Paris May 18, 2010. Some 2,500 nurse-anaesthesiologists blocked the high-speed TGV tracks disrupting train traffic and stranding some 10, 000 passengers at the station. REUTERS/Phillipe Wojazer (FRANCE - Tags: POLITICS CIVIL UNREST HEALTH EMPLOYMENT BUSINESS) 

French riot police and gendarmes evacuate a nurse-anaesthesiologist from the tracks as they block the Montparnasse train station during a demonstration to protest hospital working conditions in Paris May 18, 2010. Some 2,500 nurse-anaesthesiologists blocked the high-speed TGV tracks disrupting train traffic and stranding some 10, 000 passengers at the station. REUTERS/Phillipe Wojazer (FRANCE - Tags: POLITICS CIVIL UNREST HEALTH EMPLOYMENT BUSINESS) 

French riot police and gendarmes evacuate a nurse-anaesthesiologists from the tracks as they block the Montparnasse train station during a demonstration to protest hospital working conditions in Paris May 18, 2010. Some 2,500 nurse-anaesthesiologists blocked the high-speed TGV tracks disrupting train traffic and stranding some 10, 000 passengers at the station. REUTERS/Phillipe Wojazer (FRANCE - Tags: POLITICS CIVIL UNREST HEALTH EMPLOYMENT BUSINESS) 

A team of cleaners use disinfectant to mop the road after human blood was spilled on the gates of the Government house in Bangkok March 16, 2010. Thousands of protesters in Thailand donated blood and poured it later outside the premier's office on Tuesday, a "sacrifice for democracy" aimed at energising their movement after the government refused to step down. REUTERS/Chaiwat Subprasom (THAILAND - Tags: POLITICS HEALTH CIVIL UNREST) 

Reyna, a female jaguar, receives dental treatment at a veterinary clinic in Envigago near Medellin March 13, 2010. Reyna is homed at Santafe Zoo in Medellin after being rescued a year ago. REUTERS/Albeiro Lopera (COLOMBIA - Tags: SOCIETY ANIMALS) 

Israeli nurses stand over a doll, representing an injured baby, during a drill simulating a biological attack, at Chaim Sheba Medical Center near Tel Aviv January 13, 2010. REUTERS/Gil Cohen Magen (ISRAEL - Tags: HEALTH IMAGES OF THE DAY) FOR BEST QUALITY IMAGE: ALSO SEE GM1E61K1KKD01 

Medical workers wait for mock victims to arrive by ambulance to Chaim Sheba Medical Center near Tel Aviv during a drill simulating a biological attack January 13, 2010. REUTERS/Gil Cohen Magen (ISRAEL - Tags: HEALTH) 

A Palestinian doctor rests after taking part in a surgical procedures training session led by French surgeon Christopher Bulstrode (not seen) at the Nasser hospital in Khan Younis in the southern Gaza Strip December 15, 2009. Bulstrode arrived in Gaza on Monday for a one-week training session, aiming at upgrading the knowledge of orthopedic surgeons from Gaza in the field of war and trauma orthopedic medicine. REUTERS/Suhaib Salem (GAZA - Tags: HEALTH) 

French surgeon Christopher Bulstrode (2nd L) operates on a Palestinian patient as he trains Palestinian doctors in surgical procedures at the Nasser hospital in Khan Younis in the southern Gaza Strip December 15, 2009. Bulstrode arrived in Gaza on Monday for a one-week training session, aiming at upgrading the knowledge of orthopedic surgeons from Gaza in the field of war and trauma orthopedic medicine. REUTERS/Suhaib Salem (GAZA - Tags: HEALTH) 

Doctors conduct cataract surgeries at Qadr hospital's operation room in Tangerang, Indonesia's Banten province, October 17, 2009. A total of 67 villagers received new lenses for their eyes as part of a joint initiative by the Indonesian Lions Club Foundation and the Indonesian Eye Specialists Association (perdami) offering free cataract surgery for the poor. Indonesia has the highest record of blindness in Asia, with around four million visually-impaired people, according to a Perdami official. A cataract operation costs between 5 million to 10 million Indonesian rupiah ($500 to $1000) and the initiative helps conduct cataract surgery for those who are not able to afford medical treatment. REUTERS/Beawiharta (INDONESIA SOCIETY HEALTH) 

A boy cries while being circumcised at Kouba Hospital in Algiers September 18, 2009. Circumcision is compulsory for Muslim boys under Sharia law (Islamic law). REUTERS/Zohra Bensemra (ALGERIA SOCIETY RELIGION IMAGES OF THE DAY) 

A nurse cleans the bathroom at an isolation unit at the 'Dortmund Klinikum' hospital on July 28, 2009. REUTERS/Ina Fassbender (GERMANY HEALTH) 

A nurse checks the temeperature of a nine months old baby in a government hospital in Calapan city on the island of Mindoro south of Manila July 23, 2009. The baby is among the more than 1000 suspected cases of Influenza A H1N1 in Calapan, the city mayor said on Thursday. REUTERS/Erik de Castro (PHILIPPINES DISASTER HEALTH) 

A physician gives a prescription to a patient at a public hospital in Buenos Aires, June 29, 2009. Argentina has reinforced overwhelmed hospitals as flu cases swamp emergency rooms and H1N1 deaths rise during the depths of the southern hemisphere winter. The South American country has confirmed 1,587 cases from the new strain of virus, also known as swine flu, which is spreading. Many of the cases have been reported in the densely populated working-class suburbs and impoverished slums that ring Buenos Aires. Argentina's health minister resigned on Monday amid an outbreak of the deadly H1N1 flu strain that has killed 26 people in the country, the government's cabinet chief said. REUTERS/Carolina Camps (ARGENTINA HEALTH POLITICS) 

A medical staff member prepares to help operate on a woman whose leg was amputated after a snake bite at a health clinic run by the medical charity Medecins Sans Frontieres (Doctors Without Borders) near the town of Nasir in southeastern Sudan June 22, 2009. REUTERS/Finbarr O'Reilly (SUDAN SOCIETY HEALTH) 

Hospital workers wearing masks pull a trolley in Ditan Hospital, where an 18-year-old Chinese woman, the third confirmed case of the new H1N1 strain of flu in mainland China, is quarantined, in Beijing May 17, 2009. The Ministry of Health on Saturday evening confirmed the third case of H1N1 flu on the Chinese mainland, Xinhua reported. REUTERS/Jason Lee (CHINA HEALTH) 

Workers from the Home Affairs Department wearing protective suits prepare to move into a hotel in which guests and staff were ordered to stay inside in Hong Kong May 5, 2009. Travellers quarantined in a Hong Kong hotel for a week after a Mexican guest tested positive for influenza A (H1N1), formerly referred to as swine flu, expressed frustration on Saturday at the tough steps and a medical expert said authorities had over-reacted. About 200 hotel guests and 100 staff were ordered to stay inside the hotel. REUTERS/Bobby Yip (CHINA HEALTH) 

A nurse prepares a special room for any suspected cases of bird or swine flu in Dr Sutomo hospital in Surabaya, East Java province April 29, 2009. Asia, a continent that has battled deadly viruses such as the H5N1 bird flu and SARS in recent years, has been taking steps to ward off the new swine flu virus which has killed 159 people in Mexico.
REUTERS/Sigit Pamungkas (INDONESIA HEALTH) 

Medical personnel wear protective suits as people walk through the hallway of the Naval Hospital in Mexico City April 28, 2009. The World Health Organisation said on Tuesday the current outbreak of swine flu could lead to only a mild pandemic but warned the 1918 flu pandemic, which killed tens of millions, started that way. REUTERS/Stringer (MEXICO ENVIRONMENT HEALTH IMAGES OF THE DAY) 

Medical staff wearing protective masks stand in an assessment area for patients with symptoms of respiratory illnesses at a hospital in Singapore April 27, 2009. Countries around the world have moved to contain the spread of a possible pandemic after a new swine flu outbreak killed 103 people in Mexico. Twenty cases have been identified in the United States and six in Canada, with no deaths reported. REUTERS/Vivek Prakash (SINGAPORE HEALTH SOCIETY) 

Nepali health workers collect culled chickens at Kakarvitta, near the Indian border, 275 km (170 miles) southeast of Kathmandu, January 22, 2009. The deadly H5N1 bird flu virus has been found in dead poultry and wild birds in India's northeastern state of Sikkim, which borders China and Nepal, and authorities plan to start culling poultry soon, an official said on Tuesday. REUTERS/Khilanath Dhakal (NEPAL) 

Budapest Zoo's oldest gorilla Liesel's arm and hand are seen during an operation in Budapest January 15, 2009. The surgery became necessary due to the progress of a tumour, which could cause the death of the ape. During the three-hour long intervention, doctors for humans, with assistance from the zoo's veterinarians, checked the 32-year-old female, lowland gorilla's fibroids in its uterus, which are anatomically very similar to the human body. Surgery on gorillas is extremely rare, and this was the first time that this kind of intervention was necessary in Hungary. Picture taken January 15, 2009. REUTERS/Pool (HUNGARY) 

Surgeons circumcise a boy at Beni Messous Hospital in Algiers September 26, 2008. Circumcision is compulsory for Muslim boys under the Sharia law (Islamic Law). REUTERS/Zohra Bensemra (ALGERIA) 

A man injured in the armed conflict between Georgia and Russian-backed South Ossetian separatists receives medical treatment at a hospital in Tbilisi August 19, 2008. Russia's partial occupation of Georgia following a brief war over the rebel, pro-Moscow province of South Ossetia has alarmed the West. The United States has demanded that the Kremlin abide by a ceasefire deal and pull out immediately. REUTERS/David Mdzinarishvili (GEORGIA) 

Peruvian Gloria Kusi Quispe gives birth in the vertical position at the Belempampa Health Clinic in Cuzco May 23, 2008. Belempampa is one of many clinics in Peru that have started to allow women to give birth on their feet, instead of having women lie on their backs to deliver as in most developed countries. Standing or sitting during childbirth, ancient positions that are even depicted on ancient Andean pottery, helps to reduce pressure on the uterus and increase the oxygen flow to the fetus, while reducing labor and delivery time, according to the Peruvian health ministry. Picture taken May 23, 2008. To match Reuters Life! PERU-BIRTH/ REUTERS/Mariana Bazo (PERU) 

Peruvian Viviana Champe gives birth in the vertical position at the Belempampa Health Clinic in Cuzco May 23, 2008. Belempampa is one of many clinics in Peru that have started to allow women to give birth on their feet, instead of having women lie on their backs to deliver as in most developed countries. Standing or sitting during childbirth, ancient positions that are even depicted on ancient Andean pottery, helps to reduce pressure on the uterus and increase the oxygen flow to the fetus, while reducing labor and delivery time, according to the Peruvian health ministry. Picture taken May 23, 2008. REUTERS/Mariana Bazo (PERU) 

Peruvian Mary Luz Rojas begins to give birth in the vertical position at the Belempampa Health Clinic in Cuzco May 22, 2008. Belempampa is one of many clinics in Peru that have started to allow women to give birth on their feet, instead of having women lie on their backs to deliver as in most developed countries. Standing or sitting during childbirth, ancient positions that are even depicted on ancient Andean pottery, helps to reduce pressure on the uterus and increase the oxygen flow to the fetus, while reducing labor and delivery time, according to the Peruvian health ministry. Picture taken May 22, 2008. REUTERS/Mariana Bazo (PERU) 

Dr Manoj Kumar J Manwani (L), senior consultant in cosmetic and plastic surgery, and his assistant perform cosmetic surgery inside a hospital operation theater in Mumbai May 9, 2008. For years, Indian women have been relying on the surgeon's knife for that perfect body, that flawless face, and now, the men are muscling in. Body enhancing procedures are no longer only for the female, the self-conscious or the wealthy, with India's economic boom spawning a new breed of male, middle-class professionals with the desire to look good and the money to make it happen. To match Reuters Life! INDIA-MEN/SURGERY REUTERS/Punit Paranjpe (INDIA) 

Dr Manoj Kumar J Manwani (L), senior consultant in cosmetic and plastic surgery, and his team perform cosmetic surgery inside a hospital operation theatre in Mumbai May 9, 2008. For years, Indian women have been relying on the surgeon's knife for that perfect body, that flawless face, and now, the men are muscling in. Body enhancing procedures are no longer only for the female, the self-conscious or the wealthy, with India's economic boom spawning a new breed of male, middle-class professionals with the desire to look good and the money to make it happen. Picture taken May 9, 2008. To match INDIA-MEN/SURGERY REUTERS/Punit Paranjpe (INDIA) 

Surgeons treat a man who set himself on fire, at the emergency room of the Unfallkrankenhaus Berlin (UKB) hospital in Berlin April 27, 2008. The special burn injuries center is one of Europe's most modern departments to treat patients with heaviest burn injuries optimally and to complete skin transplantation. REUTERS/Fabrizio Bensch (GERMANY) 

A man who set himself on fire lies on a stretcher at the emergency room of the Unfallkrankenhaus Berlin (UKB) hospital in Berlin April 27, 2008. The special burn injuries center is one of Europe's most modern departments to treat patients with heaviest burn injuries optimally and to complete skin transplantation. REUTERS/Fabrizio Bensch (GERMANY) 

A nurse peers into the emergency room of the Unfallkrankenhaus Berlin (UKB) hospital in Berlin April 27, 2008. The special burn injuries center is one of Europe's most modern departments to treat patients with heaviest burn injuries optimally and to complete skin transplantation. REUTERS/Fabrizio Bensch (GERMANY) 

A surgeon changes an infusion bag as he treats a man who set himself on fire, at the emergency room of the Unfallkrankenhaus Berlin (UKB) hospital in Berlin April 27, 2008. The special burn injuries center is one of Europe's most modern departments to treat patients with heaviest burn injuries optimally and to complete skin transplantation. REUTERS/Fabrizio Bensch (GERMANY) 

Surgeons perform a total knee arthroplasty operation in an operating room at the Ambroise Pare hospital in Marseille, southern France, April 14, 2008. REUTERS/ Jean-Paul Pelissier (FRANCE) 

A nurse prepares a patient before a total knee arthroplasty operation in an operating room at the Ambroise Pare hospital in Marseille, southern France, April 14, 2008. REUTERS/ Jean-Paul Pelissier (FRANCE) 

A surgeon checks X-rays before a total knee arthroplasty operation in an operating room at the Ambroise Pare hospital in Marseille, southern France, April 14, 2008. REUTERS/ Jean-Paul Pelissier (FRANCE) 

A nurse checks the medical equipment during a total knee arthroplasty operation in an operating room at the Ambroise Pare hospital in Marseille, southern France, April 14, 2008. REUTERS/ Jean-Paul Pelissier (FRANCE)