1. From the Centre for Clinical Research, Dalarna
2. Department of Public Health and Caring Sciences, Family Medicine and Clinical Epidemiology Section, Uppsala University, Uppsala
3. Department of Clinical Microbiology, Division of Laboratory Medicine, County Hospital Ryhov, Jönköping
4. Department of Clinical Microbiology, Capio Diagnostik AB, Capio St Görans Hospital, Stockholm
5. Department of Microbiology, Tumour and Cell Biology, Karolinska Institute, Stockholm
6. Unit of Research and Development in Primary Care, Jönköping
7. Department of Medical and Health Sciences, Linköping University, Linköping, Sweden