1. Institute of Social Medicine and Health Systems Research, Medical Faculty Otto von Guericke University Magdeburg Germany
2. Murdoch Children's Research Institute Parkville Victoria Australia
3. Centre for Food & Allergy Research Parkville Victoria Australia
4. Faculty of Health Sciences Brandenburg, Brandenburg Medical School Theodor Fontane Institute for Health Services and Health System Research Rüdersdorf Germany
5. Center for Health Services Research, Brandenburg Medical School Theodor Fontane Rüdersdorf Germany
6. Child Health Research Centre The University of Queensland Brisbane Queensland Australia
7. Population Health Research Institute St. George's University London London UK
8. Pediatric Epidemiology, Department of Pediatrics, Medical Faculty Leipzig University Leipzig Germany