1 Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Northwestern University, Chicago, Illinois.
2 Department of Obstetrics and Gynecology, University of Colorado School of Medicine, Aurora, Colorado.
3 Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, School of Medicine, San Francisco, California.
4 Department of Obstetrics and Gynecology, Oregon Health and Science University, Portland, Oregon.