1. Department of Endocrinology, Diabetes and Metabolism, Elena Venizelou Hospital, GR-11521 Athens, Greece
2. Department of Health Promotion Sciences, Maternal and Infantile Care, Internal Medicine and Medical Specialties (Promise), School of Medicine, University of Palermo, Via del Vespro, 141, 90127 Palermo, Italy
3. Department of Nuclear Medicine, Ippokration Hospital, Thessaloniki, GR-54642, Greece