1 Department of Pediatrics, University Hospital Centre Osijek, J. Huttlera 4, 31000 Osijek, Croatia; Faculty of Medicine, University J. J. Strossmayer Osijek, J. Huttlera 4, 31000 Osijek, Croatia.
2 Department of Pediatrics, University Hospital Centre Osijek, J. Huttlera 4, 31000 Osijek, Croatia; Faculty of Medicine, University J. J. Strossmayer Osijek, J. Huttlera 4, 31000 Osijek, Croatia. Electronic address: darjankardum@gmail.com.