1. Internal Medicine and Diabetology Department, Medical University of Lodz, Lodz, Poland.
2. Postgraduate Institute of Pediatrics, Medical and Health Science Center, University of Debrecen, Debrecen, Hungary.
3. Department of Theoretical Health Sciences, Faculty of Health Care, University of Miskolc, Miskolc, Hungary.
4. Department of Diabetology, National Medical Academy of Post-Graduate Education, Institute of Endocrinology and Metabolism of National Academy of Medical Science, Kiev, Ukraine.
5. Department of Endocrinology and Diabetology, Nicolaus Copernicus University in Toruń, Toruń, Poland.
6. Ludwik Rydygier Collegium Medicum in Bydgoszcz, Bydgoszcz, Poland.
7. Department of Internal Medicine, Second Faculty of Medicine, Charles University, Prague, Czech Republic.
8. Faculty Hospital Motol, Prague, Czech Republic.
9. Department of Diabetology and Metabolic Diseases, Medical University of Lodz, Lodz, Poland.
10. Department of Endocrinology, Diabetes and Metabolic Diseases, University Medical Center, Ljubljana, Slovenia.
11. Clinical Hospital Centre, Split, Croatia.
12. Department for Endocrinology, Diabetes and Metabolic Diseases, Clinical Centre of Serbia, Faculty of Medicine, University of Belgrade, Belgrade, Serbia.
13. National Institute for Endocrinology and Diabetology, Lubochna, Slovakia.
14. Department of Endocrinology, Diabetes and Metabolic Disorders, Dubrava University Hospital, Zagreb, Croatia.
15. Iuliu Hatieganu University of Medicine & Pharmacy, Clinical Center of Diabetes, Nutrition, Metabolic Diseases, Cluj-Napoca, Romania.
16. Clinical Center of Endocrinology, Medical University, Sofia, Bulgaria.
17. First Department of Internal Medicine, University of Szeged, Szeged, Hungary.
18. Department of Hypertension and Diabetology, Medical University of Gdańsk, Gdańsk, Poland.