1. Outpatient Clinic for Sick Children Dr. Sabol, 10000 Zagreb, Croatia
2. Faculty of Medicine, JJ Strossmayer University of Osijek, 31000 Osijek, Croatia
3. Children’s Hospital Srebrnjak, 10000 Zagreb, Croatia
4. Faculty of Medicine, Catholic University of Croatia, 10000 Zagreb, Croatia
5. Prima Nova, Healthcare Institution, 10000 Zagreb, Croatia