1. Department of Obstetrics & Gynecology, Oregon Health & Science University, Portland, OR, USA
2. Department of Obstetrics & Gynecology, University of Michigan, Ann Arbor, MI, USA
3. Department of Obstetrics & Gynecology, Indiana University, Indianapolis, IN, USA
4. Department of Women’s Health, Dell Medical School, University of Texas at Austin, Austin, TX, USA