1. Interuniversity Centre for Education in General Practice, Kapucijnenvoer 33, Block J, P.O. Box 7001, Belgium
2. Department of Family Medicine and Primary Health Care, Ghent University, De Pintelaan 185-6K3, Belgium
3. University of Antwerp, Campus Drie Eiken, D.R. 315, Universiteitsplein 1, 2610 Wilrijk, Belgium
4. Department of Public Health and Primary Care, Academic Centre of General Practice, University of Leuven, Kapucijnenvoer 33, Block J, P.O. Box 7001, 3000 Leuven, Belgium
5. Department of Public Health and Primary Care, Academic Centre of General Practice, Catholic University Leuven, Leuven, Belgium
6. Department of Public Health and Primary Care, Academic Centre of General Practice, Academic Teaching Practice, Leuven, Belgium