1. Department of Obstetrics and Gynecology, Eastern Virginia Medical Center, Norfolk, Virginia
2. Department of Obstetrics and Gynecology, Spartanburg Regional Medical Center, Spartanburg, South Carolina
3. Department of Obstetrics and Gynecology, Portsmouth Naval Hospital, Portsmouth, Virginia
4. Department of Obstetrics and Gynecology, Geisinger Specialty Clinic, Wilkes-Barre, Pennsylvania
5. Department of Obstetrics and Gynecology, University of Mississippi, Jackson, Mississippi
6. Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas