1 Centre for Evidence-Based Practice Belgian Red Cross Mechelen, Belgium E-mail: anne-catherine.vanhove@cebap.org Centre for Evidence-Based Practice Belgian Red Cross Mechelen, Belgium and Cochrane Belgium Center for Evidence-Based Medicine (Cebam) Leuven, Belgium Centre for Evidence-Based Practice Belgian Red Cross Mechelen, Belgium and Department of Public Health and Primary Care Faculty of Medicine KU Leuven Leuven, Belgium Belgian Red Cross Mechelen, Belgium and Department of Public Health and Primary Care Faculty of Medicine KU Leuven Leuven, Belgium and Faculty of Medicine and Health Sciences Ghent University Ghent, Belgium.