1. Division of Infertility and Reproductive Endocrinology (A.S., I.R.), Department of Gynecology, Obstetrics and Gynecological Oncology, Karol Marcinkowski University of Medical Sciences, 61-701 Poznan, Poland;
2. Division of Reproductive Endocrinology and Infertility (A.S., D.H.W., A.C., J.V., A.J.D.), Department of Obstetrics and Gynecology, University of California Davis, Sacramento, California 95817;
3. Polish Academy of Sciences, Medical Research Center (P.C.P.), 02-106 Warsaw, Poland