[1] VU University Amsterdam,Department of Health Sciences & EMGO+ Institute for Health and Care Research, Faculty of Earth & Life Sciences
[2] Radboud University Nijmegen Medical Centre,Scientific Institute for Quality of Health Care
[3] Avansplus,Department of Manual Therapy, Faculty of Medicine and Pharmacy
[4] University for Professionals,Department of Epidemiology and Biostatistics & the EMGO+ Institute for Health and Care Research
[5] Free University of Brussels,undefined
[6] VU University Medical Center,undefined