1. Section and Research Unit of General Practice, Department of Public Health, University of Copenhagen, 1353 Copenhagen, Denmark
2. Unit of PharmacoTherapy, Epidemiology and Economics, Groningen Research Institute of Pharmacy, University of Groningen, 9713 AV Groningen, The Netherlands
3. School of Health Sciences, University of KwaZulu-Natal, Durban 4041, South Africa
4. Center for General Practice, Department of Clinical Medicine, Aalborg University, 9220 Aalborg, Denmark
5. Audit Project Odense, Research Unit for General Practice, Department of Public Health, University of Southern Denmark, 5000 Odense, Denmark