1. Institute of General Practice, First Faculty of Medicine, Charles University, Prague, Czech Republic;
2. Department of General Practice, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands;
3. Nivel (Netherlands Institute for Health Services Research), Utrecht, the Netherlands;
4. Department of General Practice & Elderly Care Medicine, Amsterdam Public Health Research Institute, Amsterdam University Medical Centers, Amsterdam, the Netherlands;
5. Clinic of Social and Family Medicine, School of Medicine, University of Crete, Greece;
6. Division of Family Medicine and Primary Care, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institute, Stockholm, Sweden;
7. Department of Medical Sciences, Cardiovascular Epidemiology, Uppsala University, Uppsala, Sweden;
8. Research unit of General Practice, Department of Public Health, University of Southern DenmarkOdense, Denmark