1. Institute for Clinical Microbiology and Hygiene, University Clinic Regensburg, 93053 Regensburg, Germany
2. Centre for Rhinology and Allergology, 65183 Wiesbaden, Germany
3. Department of Pediatrics with Clinical Assessment Unit, Medical University of Warsaw, 02-091 Warsaw, Poland
4. Private Practice for Pulmonology, Internal Medicine and Pneumology, 5020 Salzburg, Austria
5. Department of Allergy, Lung Diseases, and Internal Medicine, Central Clinical Hospital, Ministry of Interior, 02-507 Warsaw, Poland
6. Lung Centre Frankfurt Maingau-Hospital, 60316 Frankfurt am Main, Germany