1. Centre for Evidence-Based Practice, Belgian Red Cross-Flanders, Mechelen, Belgium
2. Department of Public Health and Primary Care, Faculty of Medicine, KU Leuven, Leuven, Belgium
3. Faculty of Social Sciences, KU Leuven, Leuven, Belgium
4. Centre for Population Health Research, University of South Australia, Adelaide, Australia
5. Environmental Social Sciences, EAWAG, Dübendorf, Switzerland
6. Division of Community Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
7. Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium
8. Centre for Evidence-Based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa