1. Medical Faculty and University Hospital, Center of Prevention and Rehabilitation, UniReha, University of Cologne, Cologne, Germany.
2. Department of Pediatrics, Medical Faculty and University Hospital, University of Cologne, Cologne, Germany.
3. Department of International Health, School CAPHRI, Care and Public Health Research Institute, Maastricht University, Maastricht, the Netherlands.
4. Department of Pediatric Neurology, University Children's Hospital (UKGM) and Medical Faculty, Justus Liebig University of Giessen, Giessen, Germany.