Medical personnel wearing personal protective equipment out of concern for the coronavirus remove a person from an ambulance near an entrance to Massachusetts General Hospital, in Boston, Monday, April 20, 2020. (AP Photo/Steven Senne)
In this Tuesday, Aug. 14, 2012, file 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) ** FILE **
In this Tuesday, Aug. 14, 2012, file 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) ** FILE **
S.W.A.T. team members stand guard on the campus of Massachusetts General Hospital following an explosion at the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. (AP Photo/Michael Dwyer)