1. The Center for Human Reproduction, New York, New York 10021
2. Foundation for Reproductive Medicine, New York, New York 10021
3. Laboratory of Stem Cell Biology and Molecular Embryology, Rockefeller University, New York, New York 10065
4. Department of Obstetrics and Gynecology, University of Vienna School of Medicine, 1090 Vienna, Austria
5. Department of Obstetrics and Gynecology, Wake Forest University, Winston Salem, North Carolina 27109