1. Division of Family Medicine and Primary Care, Department of Neurobiology, Care Science and Society, Karolinska Institutet, Huddinge, Sweden
2. Julius Center for Health Sciences and Primary Care, University medical Center, Utrecht, The Netherlands
3. Functional Area of Emergency Medicine, Karolinska University Hospital, Stockholm, Sweden
4. Department of Internal Medicine, Karolinska Institutet, Stockholm, Sweden
5. University Library, Karolinska Institutet, Stockholm, Sweden
6. Clinic of Social and Family Medicine, School of Medicine, University of Crete, Crete, Greece
7. Research Unit for General Practice, Institute of Public Health, University of Southern, Odense, Denmark
8. Department of General Practice, Charles University, First Faculty of Medicine, Prague, Czech Republic
9. NIVEL (Netherlands Institute for Health Services Research), Utrecht, The Netherlands
10. Department of General Practice & Elderly Care Medicine, Amsterdam Public Health Research Institute, VU University Medical Center, Amsterdam, The Netherlands
11. Department of Medical Sciences, Cardiovascular Epidemiology, Uppsala University, Uppsala, Sweden