1. Department of Pulmonology, Immunology, Rheumatology and Allergology, Children’s Hospital Zagreb, 10000 Zagreb, Croatia
2. School of Medicine, University of Split, 21000 Split, Croatia
3. Department of Cytology, Children’s Hospital Zagreb, 10000 Zagreb, Croatia
4. Referral Center for Pediatric Gastroenterology and Nutrition, Children’s Hospital Zagreb, 10000 Zagreb, Croatia
5. School of Medicine, University of Zagreb, 10000 Zagreb, Croatia
6. School of Medicine Osijek, University Josip Juraj Strossmayer, 31000 Osijek, Croatia