1 From the Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University (C.S.), and the Department of Emergency Medicine, Columbia Irving Medical Center (C.S.) - both in New York; and the Department of Emergency Medicine, School of Medicine (J.H.), the Department of Environmental and Occupational Health Sciences, School of Public Health (J.H.), and the Department of Global Health, Schools of Medicine and Public Health (J.H.), University of Washington, Seattle.