1. Department of Cardiovascular Prevention and Gender Medicine, I.R.C.C.S Policlinico San Donato , Via Morandi 30, 20097 San Donato Milanese , Italy
2. Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia , 27100 Pavia , Italy
3. Research Center for Reproductive Medicine, Gynecological Endocrinology and Menopause, I.R.C.C.S S. Matteo Foundation , 27100 Pavia , Italy