1. Department of Pediatrics, University Hospital RWTH Aachen, 52074 Aachen, Germany
2. Child and Adolescent Health Services, Public Health Department Dortmund, 44137 Dortmund, Germany
3. Institute of Nursing, School of Health Science, Zürich University of Applied Science, ZHAW, 8001 Winterthur, Switzerland
4. Friede Springer Endowed Professorship for Global Child Health, School of Medicine, Faculty of Health, Witten/Herdecke University, 58455 Witten, Germany