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Associated Press
In this Tuesday, Aug. 14, 2012 photo Leana Wen, of Boston, left, who is doing her medical residency in emergency medicine at Harvard-affiliated Brigham and Women's Hospital and Massachusetts General Hospital, speaks with Josh Kosowsky, clinical director of emergency medicine, right, in the emergency department at Brigham and Women's Hospital, in Boston. Wen chose emergency medicine because the hours are more flexible than those of primary care physicians. (AP Photo/Steven Senne)

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