1. Department of Pathophysiology, Endocrine Oncology Unit, Laiko Hospital, National and Kapodistrian University of Athens, Greece
2. Division of Endocrinology, Hospital de Clínicas, University of Buenos Aires, Argentina
3. Department of Endocrinology and Diabetes Center, “G. Gennimatas”, General Hospital of Athens, Athens Greece
4. Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Oxford, UK