1. Institute of Social Medicine Epidemiology and Health Economics Charité‐Universitätsmedizin Berlin Berlin Germany
2. Centre for Paediatric and Adolescent Medicine University Medical Centre Mainz Mainz Germany
3. Department of Paediatrics University Medical Centre Düsseldorf Düsseldorf Germany
4. Department of Paediatrics Westmecklenburg Hospital Hagenow Germany
5. Department of Paediatrics Technical University of Munich Munich Germany
6. Department of Paediatrics St. Josefs Hospital Freiburg Germany
7. Max‐Delbrück‐Centre for Molecular Medicine Berlin‐Buch Germany
8. Experimental and Clinical Research Centre Charité Campus Buch Berlin Germany
9. Department of Obstetrics Charité‐Universitätsmedizin Berlin Berlin Germany
10. Department of Paediatrics Division of Pneumonology Immunology and Intensive Care Medicine incl. Rescue Center Charité‐Universitätsmedizin Berlin Berlin Germany
11. Institute of Clinical Epidemiology and Biometry University of Würzburg Würzburg Germany