1. F. Edward Herbert School of Medicine, Uniformed Services University , Bethesda, MD 20814, USA
2. John Sealy School of Medicine, University of Texas Medical Branch at Galveston , Galveston, TX 77555, USA
3. Warren Alpert Medical School, Brown University , Providence, RI 02903, USA
4. Women and Infants, Division of Reproductive Endocrinology and Infertility , Providence, RI 02905, USA