1. Department of Obstetrics and Gynecology, Tufts University School of Medicine, Boston, MA, USA
2. Department of Obstetrics and Gynecology, Beaumont Hospital, Novi, MI, USA
3. Department of Obstetrics and Gynecology, University of Saskatchewan College of Medicine, Regina, SK, Canada
4. Department of Obstetrics and Gynecology, Dell Medical School, Austin, TX, USA
5. Department of Obstetrics and Gynecology, Larner College of Medicine at the University of Vermont, Burlington, VT, Canada
6. Department of Obstetrics and Gynecology, Rocky Vista College of Osteopathic Medicine, Parker, CO, USA
7. Department of Obstetrics and Gynecology, University of Florida College of Medicine, Gainesville, FL, USA
8. Department of Obstetrics and Gynecology, University of Michigan Medical School, Ann Arbor, MI, USA
9. Department of Obstetrics and Gynecology, University of Connecticut School of Medicine, Farmington, CT, USA
10. Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston, MA, USA
11. Department of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Boston, MA, USA
12. Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO, USA
13. Department of Obstetrics and Gynecology, Brody School of Medicine at East Carolina University, Greenville, NC, USA
14. Department of Obstetrics and Gynecology, Loyola University Medical Center, Hines, IL, USA