1. Department of Medical and Health Sciences, Division of Community Medicine, Linköping University, Linköping, Sweden;
2. Primary Health Care Center in Mantorp, and Department of Medical and Health Sciences, Linköping University, Mantorp, Sweden;
3. 1177 Medical Advisory Service, Linköping, Sweden;
4. Research and Development Unit in Region Östergötland and Department of Medical and Health Sciences, Linköping University, Linköping, Sweden