1. Institute of Clinical Physiology (M.M.), Italian National Research Council, 56124 Pisa, Italy
2. Obesity Center at the Endocrinology Unit (M.M., I.B., G.S., F.S.), Pisa University-Hospital Department of Clinical and Experimental Medicine, 56124 Pisa, Italy
3. Laboratory of Neurobiology (I.B.), Scuola Normale Superiore, 56100 Pisa, Italy