| Affiliation: | 1. Community Health Sciences, Boston University School of Public Health, Boston, Massachusetts;2. Massachusetts Department of Public Health, Boston, Massachusetts;3. Obstetrics and Gynecology, Brigham and Women''s Hospital, Harvard Medical School, Boston, Massachusetts;4. MGH Center for Child and Adolescent Health Research and Policy, Massachusetts General Hospital for Children, Boston, Massachusetts;5. Obstetrics, Gynecology and Reproductive Biology, Michigan State University, East Lansing, Michigan;6. Obstetrics and Gynecology, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire |
