Received: 24 May 2017
Accepted: 13 June 2019
First Online: 19 June 2019
Ethics approval and consent to participate
: The study was approved by Human Research Ethics Committees of University Pediatric Clinic, Medical Faculty, Skopje, and the Local Ethics Committee.
: All of the participants were informed and written consent was obtained when the patients participating in this study.
: The authors declare that they have no competing interests.