1. Department of Public Health, Research Unit of General Practice, University of Southern Denmark , Odense , Denmark
2. Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark , Odense , Denmark
3. Department of Diagnostic Center, Svendborg Hospital, OUH , Svendborg , Denmark
4. Audit Project Odense, Research Unit of General Practice, Department of Public Health, University of Southern Denmark , Odense , Denmark