1 Department of Pediatric Pneumonology and Allergy, Medical University of Warsaw, Warsaw, Poland.
2 Department of Pediatric Pneumonology and Allergy, Medical University of Warsaw, Warsaw, Poland; Doctoral School, Medical University of Warsaw, Warsaw, Poland.
3 Department of Pediatric Pneumonology and Allergy, Medical University of Warsaw, Warsaw, Poland. Electronic address: wojciech.feleszko@wum.edu.pl.