1. Department of Medicine and Department of Obstetrics and Gynecology, University of Connecticut School of Medicine, Farmington, Connecticut, USA
2. Division of Reproductive Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
3. Department of Mother & Child Health Research, Institute for Clinical Effectiveness and Health Policy, Buenos Aires, Argentina
4. Department of Obstetrics and Gynecology, Oregon Health and Science University, Portland, Oregon, USA
5. Global Network for Perinatal and Reproductive Health, Portland, Oregon, USA
6. Department of Obstetrics and Gynecology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
7. Department of Obstetrics and Gynecology, Drexel University School of Medicine, Philadelphia, Pennsylvania, USA
8. Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota, USA
9. Keck School of Medicine, University of Southern California, Los Angeles, California, USA
10. National Cancer Institute, Tobacco Control Research Branch, Bethesda, Maryland, USA