1. Department of Obstetrics, Gynecology and Reproductive Sciences (S.K.F., X.L., A.D., W.L., R.K.S., G.G., L.D.P., K.K., P.F.R.), University of California San Francisco, San Francisco, California 94143;
2. Nevada Center for Reproductive Medicine (G.G.), Reno, Nevada 89511;
3. Obstetric and Gynecology Department (L.D.P.), University of Turin, Turin, Italy;
4. Oregon Health & Science University (K.K.), Portland, Oregon 97239
5. Department of Pediatrics (K.A., E.M.), University of California San Francisco, San Francisco, California 94143;