Received: 11 March 2021
Accepted: 18 July 2021
First Online: 3 August 2021
: The study protocol was approved by the local Ethics Committee at Srebrnjak Children`s Hospital, Zagreb, Croatia. Informed consent was obtained from the children's parents/legal guardians.
: All authors have read the manuscript and consent to publish it.
: The authors declare that they have no competing interests.