1. Leuven Institute for Healthcare Policy; Leuven Belgium
2. Academic Centre for General Practice; KU Leuven; Leuven Belgium
3. Department of Endocrinology; OLV Hospital Aalst; Moorselbaan Aalst Belgium
4. Interuniversity Institute for Biostatistics and Statistical Bioinformatics; University of Leuven and University of Hasselt; Leuven Belgium
5. Department of Public Health; Ghent University; Ghent Belgium