1. Radiology Unit, Department of Diagnostic and Preventive Medicine, S. Orsola-Malpighi Hospital, Via Albertoni 15, 40138 Bologna, Italy.
2. Endocrinology Unit, Department of Medical and Surgical Sciences, Alma Mater Studiorum-University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy.
3. Present address: Medizinische Klinik und Poliklinik IV, Klinikum der Universitat Munchen, Munchen, Germany.
4. Department of Medical and Surgical Sciences, Alma Mater Studiorum-University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy.