1. Department of Pediatrics, University of Cologne, Medical Faculty and University Hospital, Cologne, Germany
2. Centre for Prevention and Rehabilitation, University of Cologne, Medical Faculty and University Hospital, Cologne, Germany
3. Department for Pediatric Neurology, Justus-Liebig University of Giessen, Giessen, Germany
4. Department for International Health, FHML, Maastricht University, Maastricht, The Netherlands