1. Division of Endocrinology and Metabolism and Diabetes Center, First Department of Internal Medicine, Medical School Aristotle University of Thessaloniki, AHEPA University Hospital Thessaloniki Greece
2. Department of Diabetes and Endocrinology Epsom & St Helier University Hospitals Surrey UK
3. Unit for Metabolic Medicine, Cardiovascular Division, Faculty of Life Sciences & Medicine King's College London UK
4. Clinic for Endocrinology, Diabetes and Metabolic Disorders, Clinical Centre of Vojvodina, Novi Sad, Serbia; Medical Faculty University of Novi Sad Novi Sad Serbia