1. Division of Endocrinology and Diabetes, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21, 00128 Rome, Italy
2. Division of Bone and Mineral Diseases, Washington University in St Louis, St Louis, MO, USA
3. Centre for Diabetes, The Blizard Building, Barts and The London School of Medicine, Queen Mary, University of London, London, UK
4. Division of Endocrinology, Mount Sinai School of Medicine, New York, USA