1. Department of Medicine, Unit of Metabolic Diseases, University of Padua, Via Giustiniani no. 2, 35128 Padua, Italy
2. Department of Endocrinology & Metabolism, Section of Metabolic Diseases & Diabetes, AOUP Pisa, University of Pisa, Ospedale Cisanello, Via Paradisa no. 2, 56124 Pisa, Italy
3. Department of Gynecology, Perinatology and Human Reproduction, University of Florence, Viale Giovan Battista Morgagni no. 85, 50134 Florence, Italy
4. CNR, Institute of Clinical Physiology, Via G. Moruzzi no. 1, 56124 Pisa, Italy