Received: 25 December 2020
Accepted: 26 January 2021
First Online: 5 February 2021
Ethics approval and consent to participate
: The institutional review board of Tehran University of Medical Sciences reviewed and approved the study protocol, with a waiver of written consent due to the retrospective nature of the study. All patients/parents were informed that their data will be used in the study, and all gave verbal consent.
: Not applicable.
: The authors declare that they have no competing interests.