1. Department of Pulmonary Medicine, Faculty of Medicine in Pilsen, University Hospital, Charles University, Prague, Czech Republic;
2. Department of Paediatrics, Motol University Hospital, 2nd Faculty of Medicine, Charles University, Prague, Czech Republic;
3. Data Analysis Department, Institute of Biostatistics and Analysis, Brno, Czech Republic;
4. Department of Allergology and Clinical Immunology, University Hospital Olomouc, Olomouc, Czech Republic