1. Medical Faculty and University Hospital, Centre of Prevention and Rehabilitation, Cologne, Germany
2. Medical Faculty and University Hospital, Department of Pediatrics, University of Cologne, Cologne, Germany
3. Faculty of Health, Medicine and Life Sciences, Department of International Health, Care and Public Health Research Institute, School CAPHRI, Maastricht University, Maastricht, The Netherlands
4. Department of Pediatric Neurology, Social Pediatrics and Epileptology, Justus-Liebig-University Giessen and UKGM, Giessen, Germany
5. Cologne Centre for Musculoskeletal Biomechanics (CCMB), University of Cologne, Cologne, Germany
6. Centre for Rare Skeletal Diseases in Childhood, University of Cologne, Cologne, Germany