1. Center of Prevention and Rehabilitation - UniReha , University of Cologne, Medical Faculty and University Hospital , Cologne , Germany
2. Department of Pediatrics , University of Cologne, Medical Faculty and University Hospital , Cologne , Germany
3. Department for Pediatric Neurology , Epileptology and Social Pediatrics, Justus-Liebig University , UKGM , Giessen , Germany
4. Cologne Centre for Musculoskeletal Biomechanics, University of Cologne , Cologne , Germany