1. Department of General Paediatrics, Adolescent Medicine and NeonatologyMedical Centre, Faculty of Medicine, University of Freiburg Freiburg Germany
2. Childrens Hospital, Schwarzwald Baar Hospital Villingen‐Schwenningen Germany
3. Department of Sport, Exercise and Health, Division of Preventive Sports Medicine and Systems PhysiologyUniversity of Basel Basel Switzerland
4. Institute for Exercise and Occupational Medicine, Medical CentreFaculty of Medicine, University of Freiburg Freiburg Germany