1. Department of Internal Medicine Treant Care Group Hoogeveen The Netherlands
2. Bethesda Diabetes Research Center Hoogeveen The Netherlands
3. Department of Statistics, Faculty of Economics Facultés Universitaires Catholiques de Mons, Louvain Academy Mons Belgium
4. Department of Internal Medicine and Cardiovascular Research Institute Maastricht Maastricht University Medical Center Maastricht The Netherlands
5. Department of Internal Medicine University Medical Center Groningen Groningen The Netherlands