1. From the Department of Emergency Medicine, University of Colorado School of Medicine, and the Department of Environmental and Occupational Health and the Center for Health, Work, and Environment, Colorado School of Public Health, University of Colorado — both in Aurora (C.S.); and the Centro de Hemodiálisis, San Salvador, and the Emergency Social Fund for Health, Centro Monseñor Romero, Tierra Blanca — both in El Salvador (R.G.-T.).