1 Department of Pulmonary Medicine, University Hospital and Faculty of Medicine in Pilsen, Charles University, Prague, Czech Republic.
2 Department of Clinical Immunology and Allergology, University Teaching Hospital in Martin, Martin, Slovakia; Department of Pediatrics, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia; Department of Pulmonology and Phthisiology, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia. Electronic address: jesenak@gmail.com.