1. Center for Human Reproduction (N.G., A.K., A.W., D.H.B.),New York, New York 10021
2. Foundation for Reproductive Medicine (N.G., D.H.B.), New York, New York 10021
3. Department of Obstetrics, Gynecology, and Reproductive Sciences (N.G.), Yale University School of Medicine, New Haven, Connecticut 06150
4. Medical University (A.W.), Vienna 1090 Austria;and Albert Einstein College of Medicine, Bronx, New York 10461