1. Department of International Health, School for Public Health and Primary Care (CAPHRI), Faculty of Health, Medicine and Life Sciences; Maastricht University; Maastricht The Netherlands
2. Helmholtz Zentrum München; German Research Center for Environmental Health, Institute of Health Economics and Health Care Management; Neuherberg Germany
3. Helmholtz Zentrum München; German Research Center for Environmental Health, Institute of Epidemiology I; Neuherberg Germany
4. Marien-Hospital Wesel; Research Institute, Department of Pediatrics; Wesel Germany