Division of Endocrinology and Diabetes, Department of Internal Medicine I, University Hospital, University of Wuerzburg, 97080 Wuerzburg, Germany. Department of Clinical Medicine, Bufalini Hospital, 47521 Cesena, Italy. Department of Clinical Medicine and Surgery, Federico II University, 80131 Naples, Italy. UOC of Internal Medicine, AO dei Colli, Monaldi Unit, 80131 Naples, Italy. Centre for Endocrinology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, EC1M 6BQ London, UK. Clinica Medica 3, Department of Medicine, DIMED, University of Padova, 35128 Padova, Italy. Department of Experimental Medicine, Sapienza University of Rome, 00161 Rome, Italy.