1. Department of Pediatric Pneumology and Allergy University Children's Hospital Regensburg (KUNO), of the University of Regensburg and the Order of St. John at the St. Hedwig Hospital Regensburg Germany
2. Science and Innovation Campus Regensburg (WECARE) of the Order of St. John at the St. Hedwig Hospital Regensburg Germany
3. University Children's Hospital Regensburg (KUNO) of the University of Regensburg and the Order of St. John at the St. Hedwig Hospital Regensburg Germany
4. Pediatric Epidemiology Department of Pediatrics Medical Faculty Leipzig University Leipzig Germany
5. Institute of Epidemiology and Medical Biometry Ulm University Ulm Germany
6. Department of Obstetrics and Gynecology of the University of Regensburg and the Order of St. John at the St. Hedwig Hospital Regensburg Germany
7. Institute of Social Medicine and Health Systems Research Otto von Guericke University Magdeburg Germany