1. Division of Endocrinology and Metabolic Diseases, University of Verona and Azienda Ospedaliera di Verona, Verona, Italy
2. Medizinische Klinik, Abteilung für Endokrinologie, Stoffwechsel und Pathobiochemie, Eberhard-Karls-Universität, Tübingen, Germany
3. Department of Internal Medicine, University Medical Center, Utrecht, the Netherlands