1. Yale Center for Perinatal, Pediatric, and Environmental Epidemiology, Department of Epidemiology and Public Health and
2. Department of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, Connecticut, USA
3. Departments of Environmental Medicine and Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
4. Department of Environmental Health Science, College of Public Health, University of Georgia, Athens, Georgia, USA