1. Dutch College of General Practitioners; Head of the Department of Guideline development and Research; PO Box 3231 Utrecht Netherlands 3502 GE
2. Whiston Hospital; Department of Diabetes and Endocrinology; St Helens and Knowsley Hospitals NHS Trust Warrington Road Prescot Merseyside UK L35 5DR
3. University Medical Centre Utrecht; Department of Internal Medicine; P.O.Box 85500 3508 GA Utrecht Netherlands
4. University Medical Center Groningen; Department of Epidemiology; Groningen Netherlands
5. University Medical Center Utrecht; Julius Center for Health Sciences and Primary Care; Postbus 85500, Str. 6.131 Utrecht Netherlands 3508 GA