1. Mossakowski Medical Research Centre; Polish Academy of Sciences and Department of Internal Diseases, Endocrinology and Diabetology; Central Clinical Hospital MSW; Warsaw Poland
2. Third Department of Medicine; First Faculty of Medicine and General University Hospital; Charles University; Prague Czech Republic
3. Clinical Hospital Center Osijek; Osijek Croatia
4. Kartal Training and Research Hospital; Istanbul Turkey
5. Novo Nordisk A/S; Søborg Denmark
6. Aarhus University Hospital; Aarhus Denmark