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

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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

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

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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

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Angelina Jolie's decision to have a double mastectomy after genetic testing has prompted a discussion about which other tests should be covered. WPA Pool/Getty Images hide caption

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Basic hearing aids cost an average of $1,500 per ear. IStockphoto.com hide caption

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Going to the doctor may be uncomfortable for people who are worried about weight. iStockphoto.com hide caption

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Peter Lee, executive director of Covered California, unveiled the plans and prices that will be offered by private insurers at a media briefing in Sacramento on Thursday. Rich Pedroncelli/AP hide caption

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Fungi (cyan) surround a human hair within the skin. A study in the journal Nature shows the population of fungi on human skin is more diverse that previously thought. Alex Valm, Ph.D. hide caption

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Luke Tanner, 7, gets vaccinated for measles at a clinic near Swansea, Wales, in April. Wales is at the center of a measles outbreak that has been linked to one death. Geoff Caddick/AFP/Getty Images hide caption

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Group houses are becoming popular — again — among some single baby boomers, and not just for financial reasons. Marianne Kilkenny (second from right) shares her home in Asheville, N.C, with four other people. Mike Belleme/The New York Times hide caption

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Protesters march on the Texas Capitol in Austin on March 5, demanding that lawmakers expand Medicaid to include an additional 1.5 million poor people. Eric Gay/AP hide caption

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