1. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, University Utrecht; Utrecht The Netherlands
2. Department of Social and Welfare Studies; Linköping University; Linköping Sweden
3. Meander Medical Center; Amersfoort The Netherlands
4. Rijnstate Hospital; Arnhem The Netherlands
5. Hospital Group Twente; Almelo and Hengelo The Netherlands
6. Diakonessenhuis; Utrecht The Netherlands
7. Westfriesgasthuis; Hoorn The Netherlands
8. Alrijne Hospital Leiderdorp; Leiderdorp The Netherlands
9. Hospital Amstelland; Amstelveen The Netherlands
10. Medisch Spectrum Twente; Enschede The Netherlands
11. Stavanger University Hospital, University of Bergen; Stavanger Norway