1. Division of Family Medicine, Department of Clinical Sciences in Malmö, Skåne University Hospital, Lund University, 205 02 Malmö, Sweden
2. Tåbelund Primary Health Care Centre, Solv. 33, 241 31 Eslöv, Sweden
3. RSKC Competence Centre for Clinical Research, Skåne University Hospital, 22 185 Lund, Sweden