1. Department of Public Health and Primary Care, Ghent University, 9000 Ghent, Belgium
2. Research Centre, Irish College of General Practitioners, D02 XR68 Dublin, Ireland
3. Netherlands Institute for Health Services Research, 3500 BN Utrecht, The Netherlands
4. Department of Sociology, Department of Human Geography, Utrecht University, 9000 Ghent, Belgium
5. Management of Health Institutions and Services, Heimerer College, 10000 Prishtina, Kosovo
6. Faculty of Medicine, University of Basel, 4001 Basel, Switzerland
7. School of Medicine, Keele University, Keele ST5 5BG, UK
8. Public Health Department, Faculty of Medicine, Vilnius University, LT-03101 Vilnius, Lithuania
9. Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
10. Institute of General Practice, Friedrich-Alexander University Erlangen-Nürnberg (FAU), 91054 Erlangen-Nürnberg, Germany