1. Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, United States
2. Department of Gynecology and Obstetrics, School of Medicine, Emory University, Atlanta, Georgia 30322, United States
3. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, United States
4. Department of Pediatrics, New York University School of Medicine, New York, New York 10016, United States
5. Department of Environmental Medicine, New York University School of Medicine, New York, New York 10016, United States
6. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, School of Medicine, Emory University, Atlanta, Georgia 30322, United States