Marta Navratil1, Irena Ivković Jureković2. 1. Department of Pulmonology, Allergology, Rheumatology and Clinical Immunology, Children's Hospital Zagreb, Zagreb, and Faculty of Medicine, University of Osijek, Osijek, Croatia. marta.navratil@gmail.com. 2. Department of Pulmonology, Allergology, Rheumatology and Clinical Immunology, Children's Hospital Zagreb, Zagreb, and Faculty of Medicine, University of Osijek, Osijek, Croatia.