[1] Department of Obstetrics and Gynecology, Medical Center, Duke University, Box 3279, Durham, 27710, NC
[2] Uniformed Services University, Department of Obstetrics and Gynecology, Bethesda, MD
[3] Duke University, Department of Biostatistics and Bioinformatics, Durham, NC
[4] Reproductive Biology and Medicine Branch, National Institute of Child Health and Human Development, Bethesda, MD