1. Department of Obstetrics and Fetal-Maternal Medicine (K.B., P.H., S.H., L.S., J.P., M.K.), Reproductive Biology Unit, Medical University of Vienna, A-1090 Vienna, Austria
2. Prince Henry's Institute of Medical Research (S.S.), Clayton, Victoria 3168, Australia
3. Gynmed Clinic (C.F.), A-1150 Vienna, Austria