1. The Diabetes Centre Isala Zwolle The Netherlands
2. Department of Internal Medicine, University Medical Center University of Groningen Groningen The Netherlands
3. Department of Internal Medicine Isala Zwolle The Netherlands
4. Department of Internal Medicine Diakonessenhuis Utrecht The Netherlands
5. Langerhans Medical Research Group Ommen The Netherlands
6. High & Intensive Care GGZ Drenthe Mental Health Institute Assen The Netherlands
7. Department of Pathology and Medical Biology, University Medical Center University of Groningen Groningen The Netherlands