Maryland governor Larry Hogan speaks during a press conference in Baltimore, Maryland April 28, 2015. Maryland Governor Larry Hogan, a Republican who took office in January, said on June 22, 2015 he has been diagnosed with an aggressive form of cancer of the lymph nodes. Picture taken on April 28, 2015. REUTERS/Eric Thayer

Maryland governor Larry Hogan speaks during a press conference in Baltimore, Maryland April 28, 2015. Maryland Governor Larry Hogan, a Republican who took office in January, said on June 22, 2015 he has been diagnosed with an aggressive form of cancer of the lymph nodes. Picture taken on April 28, 2015. REUTERS/Eric Thayer

Maryland governor Larry Hogan speaks during a press conference in Baltimore, Maryland April 28, 2015. Maryland Governor Larry Hogan, a Republican who took office in January, said on June 22, 2015 he has been diagnosed with an aggressive form of cancer of the lymph nodes. Picture taken on April 28, 2015. REUTERS/Eric Thayer

Michael, a 36-year-old unemployed clerk, sits in the sun near a bridge in central Athens May 24, 2013. Michael worked as a hotel clerk for over fifteen years but when the hotel closed he was unable to find work and in late 2011 became homeless, two months later he was diagnosed with lymph node and thyroid cancer. He now lives outside a church. Since the debt crisis erupted in 2009, hundreds of thousands of Greeks have lost their jobs and the unemployment rate in the country reached 26.8 percent in March, new figures show. Klimaka, a nongovernmental organisation, estimated there were around 20,000 homeless in Greece in 2012. Picture taken May 24, 2013. REUTERS/Yannis Behrakis (GREECE - Tags: SOCIETY POLITICS BUSINESS EMPLOYMENT)

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Michael, 36-year-old and unemployed, begs outside a church in central Athens May 1, 2013. Michael worked as a hotel clerk for over fifteen years but when the hotel closed he was unable to find work and in late 2011 became homeless, two months later he was diagnosed with lymph node and thyroid cancer. He now lives outside a church. Since the debt crisis erupted in 2009, hundreds of thousands of Greeks have lost their jobs and the unemployment rate in the country reached 26.8 percent in March, new figures show. Klimaka, a nongovernmental organisation, estimated there were around 20,000 homeless in Greece in 2012. Picture taken May 1, 2013. REUTERS/Yannis Behrakis (GREECE - Tags: SOCIETY POLITICS BUSINESS EMPLOYMENT)

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Michael, 36-year-old and unemployed, poses by an abandoned open-air cinema in central Athens February 8, 2013. Michael worked as a hotel clerk for over fifteen years but when the hotel closed he was unable to find work and in late 2011 became homeless. Two months later he was diagnosed with lymph node and thyroid cancer. He now lives outside a church. Since the debt crisis erupted in 2009, hundreds of thousands of Greeks have lost their jobs and the unemployment rate in the country reached 26.8 percent in March, new figures show. Klimaka, a nongovernmental organisation, estimated there were around 20,000 homeless in Greece in 2012. Picture taken February 8, 2013. REUTERS/Yannis Behrakis (GREECE - Tags: SOCIETY POLITICS BUSINESS EMPLOYMENT)

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Laurie Johnston, who had an unnecessary mastectomy and removal of six lymph nodes after incorrectly being diagnosed with breast cancer sits with her lawyer Barbara MacFarlane (R) during a news conference in Toronto March 3, 2010. Johnston has launched a lawsuit against two Windsor area hospitals, the surgeon and the pathologist who analyzed her biopsy. REUTERS/ Mike Cassese (CANADA - Tags: HEALTH)

Laurie Johnston, who had an unnecessary mastectomy and removal of six lymph nodes after incorrectly being diagnosed with breast cancer, looks on during a news conference in Toronto March 3, 2010. Johnston has launched a lawsuit against two Windsor area hospitals, the surgeon and the pathologist who analyzed her biopsy. REUTERS/ Mike Cassese (CANADA - Tags: HEALTH)

Laurie Johnston, who had an unnecessary mastectomy and removal of six lymph nodes after incorrectly being diagnosed with breast cancer, looks on during a news conference in Toronto March 3, 2010. Johnston has launched a lawsuit against two Windsor area hospitals, the surgeon and the pathologist who analyzed her biopsy. REUTERS/ Mike Cassese (CANADA - Tags: HEALTH)

Laurie Johnston, who had an unnecessary mastectomy and removal of six lymph nodes after incorrectly being diagnosed with breast cancer, speaks during a news conference in Toronto March 3, 2010. Johnston has launched a lawsuit against two Windsor area hospitals, the surgeon and the pathologist who analyzed her biopsy. REUTERS/ Mike Cassese (CANADA - Tags: HEALTH)

A nurse checks the lymph nodes of a cancer patient in a hospital for oncological diseases in the Ukrainian city of Donetsk April 25, 2006. Large amounts of radioactive fallout came down on the regions around the Chernobyl nuclear power plant after the explosion of its fourth reactor in 1986, leading to a substantial increase of radiation-inflicted diseases in the population. Ukraine this week marks the 20th anniversary of the world's worst civil nuclear disaster. REUTERS/Alexander Khudotioply