Endocrinology and Metabolism Unit, University Hospital S. Maria della Misericordia of Udine, 33100 Udine, Italy. Istituto Auxologico Italiano, IRCCS, Unit for Bone Metabolism Diseases and Diabetes & Lab of Endocrine and Metabolic Research, Milan, Italy. Unit of Endocrinology and Diabetes, Campus Bio-Medico University, 00128 Rome, Italy. Unit of Metabolic Diseases, Department of Internal Medicine, Santa Maria Goretti Hospital, Latina, Italy. Department of Internal Medicine-Endocrinology "Policlinico Morgagni", Catania, Italy. Endocrinology Unit, "Casa Sollievo della Sofferenza" IRCCS-Hospital, San Giovanni Rotondo, Italy. Department of Medicine, Surgery and Neurosciences, University of Siena, Siena, Italy.