1. Institute of Epidemiology and Medical Biometry Ulm University Ulm Germany
2. Pediatric Epidemiology Department of Pediatrics Medical Faculty, Leipzig University Leipzig Germany
3. Allergy Department Hospital General Universitario Gregorio Marañón Madrid Spain
4. Population Health Research Institute St George's University of London London UK
5. Faculty of Health & Medical Sciences School of Psychology University of Surrey Guildford UK
6. Swiss Institute of Allergy and Asthma Research University of Zurich Davos Switzerland
7. University Hospital Montpellier France
8. University Hospital Pediatrics Geneva Switzerland
9. St John's Institute of DermatologyGuy's Hospital London UK
10. Institute of Epidemiology and Preventive Medicine University of Regensburg Regensburg Germany
11. Institute of Social Medicine and Health Systems Research Otto von Guericke University Magdeburg Magdeburg Germany