1. Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, 1518 Clifton Rd, Atlanta, Georgia 30329, United States
2. Department of Gynecology and Obstetrics, School of Medicine, Emory University, Atlanta, Georgia 30329, United States
3. Department of Pediatrics, New York University School of Medicine, New York, New York 10016, United States
4. Department of Environmental Medicine, New York University School of Medicine, New York, 10016, New York United States
5. School of Nursing, Columbia University, New York City, New York 10032, United States