1. Center for Research on Reproduction & Women's Health, Department of Obstetrics & Gynecology, University of Pennsylvania, Philadelphia
2. Clinica Medica University of Padova
3. Section of Endocrinology University of Padova, Department of Medical and Surgical Sciences, Padova, Italy
4. Center for Research on Reproduction & Women's Health, Department of Obstetrics & Gynecology, University of Pennsylvania, Philadelphia,