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Jen Regan strokes the head of her fiancée, Marc Fucarile, as he sleeps in his hospital bed at Massachusetts General Hospital. Fucarile was injured in the bombings at the Boston Marathon, and had to have his right leg amputated. Bill Greene/Boston Globe via Getty Images hide caption

itoggle caption Bill Greene/Boston Globe via Getty Images

A construction worker paints walls at the Maryland Proton Treatment Center in Baltimore. Each of the center's five rooms will contain a massive piece of equipment that will rotate around a cancer patient to deliver a special kind of radiation. Jenny Gold/Kaiser Health News hide caption

itoggle caption Jenny Gold/Kaiser Health News

Patients wait in line at Nuestra Clinica Del Valle in San Juan, Texas, in September 2012 file photo. A study released on Wednesday finds that immigrants, particularly noncitizens, heavily subsidize Medicare, and that policies that restrict immigration may deplete Medicare's financial resources. Eric Gay/AP hide caption

itoggle caption Eric Gay/AP

To fight antibiotic-resistant staph germs like these, a study suggests disinfecting the skin of all intensive care patients. Janice Carr/CDC hide caption

itoggle caption Janice Carr/CDC

A nurse walks towards the Roger Salengro Hospital in Lille, France, where two patients were diagnosed with a coronavirus related to SARS. Michel Spingler/AP hide caption

itoggle caption Michel Spingler/AP

Genetic changes in signaling pathways in the brain may cause schizophrenia. iStockphoto.com hide caption

itoggle caption iStockphoto.com