1. Endocrinology (F.B., I.M., G.P., F.A., S.M.), University of Cagliari, I-09042 Monserrato, Cagliari, Italy
2. Nuclear Medicine (M.P.), University of Cagliari, I-09042 Monserrato, Cagliari, Italy
3. Department of Medical Sciences “M. Aresu,” and Department of Cytomorphology, San Giovanni di Dio Hospital (M.L.L.), University of Cagliari, I-09042 Monserrato, Cagliari, Italy