1. REVAL Rehabilitation Research Centre, Faculty of Rehabilitation Sciences and Physiotherapy Hasselt University Hasselt Belgium
2. Musculoskeletal Research Unit, Department of Rehabilitation Sciences Faculty of Kinesiology and Rehabilitation Sciences Leuven University Leuven Belgium
3. Department of Biometrics Zuyd Hogeschool Heerlen The Netherlands
4. Interuniversity Institute for Biostatistics and Statistical Bioinformatics Hasselt University Hasselt Belgium