1. Department of Obstetrics and Gynecology, University of Pennsylvania Health System, Philadelphia, Pennsylvania, USA.
2. Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, USA.
3. Department of Biobehavioral Health Sciences, University of Pennsylvania School of Nursing, Philadelphia, Pennsylvania, USA.
4. Department of Obstetrics and Gynecology, Cleveland Clinic Lerner College of Medicine, Ob/Gyn and Women's Health Institute, Cleveland, Ohio, USA.