1. Ghent University; Department of Family Medicine and Primary Health Care; Campus UZ 6K3, Corneel Heymanslaan 10 Ghent Belgium 9000
2. Bond University; Centre for Research in Evidence-Based Practice (CREBP); Gold Coast Queensland Australia 4229
3. The University of Queensland; Primary Care Clinical Unit, Faculty of Medicine; Brisbane Queensland Australia 4029
4. Georgetown University Medical Center; Department of Family Medicine; 215 Kober Cogan Hall 3750 Reservoir Road, NW Washington DC USA 20007
5. University of Helsinki; Helsinki Finland
6. THL (National Institute for Health and Welfare); PO Box 30 Helsinki Finland 00271
7. University of Copenhagen; Department of Public Health / Unit of General Practice; P.O.Box 2099 DK-1014 Copenhagen Denmark