[1] Geisel School of Medicine at Dartmouth College,Department of Epidemiology
[2] National Center for Chronic Disease Prevention and Health Promotion,Division of Reproductive Health
[3] Centers for Disease Control and Prevention,Department of Obstetrics and Gynecology
[4] Geisel School of Medicine at Dartmouth College,Department of Pathology and Laboratory Medicine
[5] Geisel School of Medicine at Dartmouth College,Department of Obstetrics and Gynecology
[6] Mayo Clinic,Department of Environmental Health, Rollins School of Public Health
[7] Emory University,undefined