1. Department of Obstetrics and Gynecology, Brigham and Women’s Hospital, Boston, Massachusetts, USA
2. Department of Environmental Health Sciences, University of Michigan, Ann Arbor, Michigan, USA
3. Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts, USA
4. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
5. The Fertility Center, Vincent Memorial Obstetrics and Gynecology Service, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
6. Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA