"10.1001/jama.2011.620" . "Factors Associated With Closures of Emergency Departments in the United States"^^ . . "305" . "2011"^^ . "10.1001/jama.2011.620" . . . _:genid1 . _:genid1 . _:genid1 . _:genid1 . _:genid2 . _:genid2 . _:genid2 . _:genid2 . _:genid3 . _:genid3 . _:genid3 . _:genid3 . . . . . . .