Affiliation: | a Obstetrics and Gynecology, Stanford University Medical Center, Stanford, California b Fertility Physicians of Northern California, San Jose, California c Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, California d San Diego Fertility Center, San Diego, California e Biostatistician Consultant, Orange, California f Consultant, Huntington Beach, California g Seattle Reproductive Medicine, Seattle, Washington |