1. Department of Obstetrics and Gynecology, The University of Texas Medical Branch, Galveston, Texas and Research Laboratories of Schering AG, Berlin, Germany
2. Department of Obstetrics and Gynecology, The University of Texas Medical Branch, Galveston, Texas and Research Laboratories of Schering AG, Berlin, Germany; Division of Reproductive Sciences, Department of Obstetrics and Gynecology, The University of Texas Medical Branch, 301 University Boulevard, Route J-62, Galveston, TX 77555-1062;