1. National Centre for Diabetes Care, Budapest, Hungary;
2. Csepel Health Service, Department of Diabetology, Budapest, Hungary;
3. Semmelweis University Faculty of Medicine, 1st Department of Medicine, Budapest, Hungary;
4. Department of Epidemiology and Public Health, University College London, London, U.K.;
5. Finnish Institute of Occupational Health, Helsinki, Finland;
6. Semmelweis University School of PhD Studies, Budapest, Hungary;
7. Ferencváros Health Service, Budapest, Hungary.