1. Departments of Pediatrics (U.I.K.), Bronx, New York 10467;
2. Epidemiology and Population Health (D.W.), Albert Einstein College of Medicine, Bronx, New York 10467;
3. Department of Epidemiology (C.A.K.-G. and K.R.Y.), University of Michigan School of Public Health, Ann Arbor, Michigan 48109
4. Center for Global Health (N.K.), Boonshoft School of Medicine, Wright State University, Dayton, Ohio 45435
5. Department of Obstetrics and Gynecology and Women's Health (N.S.), University of Colorado-Denver School of Medicine, Aurora, Colorado 80045