1. Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts Amherst, Amherst, Massachusetts, USA
2. Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, Buffalo, New York, USA
3. Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Department of Health and Human Services (DHHS), Bethesda, Maryland, USA
4. Department of Global and Community Health, College of Public Health, George Mason University, Fairfax, Virginia, USA
5. Department of Biostatistics, Epidemiology and Informatics, University of Pennsylvania, Philadelphia, Pennsylvania, USA
6. Biostatistics and Bioinformatics Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver NICHD, NIH, DHHS, Bethesda, Maryland, USA
7. Department of Obstetrics and Gynecology, School of Medicine, University of Utah, Salt Lake City, Utah, USA