1. Cochrane Sweden; Hedegatan 38 Uddevalla Sweden 45152
2. University of Copenhagen; The Section of General Practice, Department of Public Health, Faculty of Health Sciences, Center for Health and Society; Copenhagen Denmark
3. University of Copenhagen; The Research Unit for General Practice, Department of Public Health, Faculty of Health Sciences, Center for Health and Society; Copenhagen Denmark
4. Zealand Region; Primary Healthcare Research Unit; Copenhagen Denmark
5. Rigshospitalet; Nordic Cochrane Centre; Blegdamsvej 9, 7811 Copenhagen Denmark DK-2100