1. Nuffield Department of Population Health University of Oxford Oxford UK
2. Groningen University Groningen Research Institute of PharmacyGroningen The Netherlands and RIVM Bilthoven The Netherlands
3. Unit of Clinical Epidemiology "Città della Salute e della Scienza" Hospital Turin Italy
4. CPO Piemonte Turin Italy
5. Research Unit for General Practice & Danish Ageing Research Center Department of Public Health University of Southern Denmark Odense Denmark
6. Steno Diabetes Center Copenhagen Gentofte Denmark
7. Department of Public Health Aarhus University Aarhus Denmark
8. National Institute of Public Health University of Southern Denmark Odense Denmark