1. The Center for Human Reproduction , New York, NY, USA
2. The Foundation for Reproductive Medicine , New York, NY, USA
3. Department of Developmental Cell Biology, Bedford Research Foundation , Bedford, MA, USA
4. Stem Cell Biology and Molecular Embryology Laboratory, The Rockefeller University , New York, NY, USA
5. Department of Obstetrics and Gynecology, Medical University of Vienna , Vienna, Austria