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Article History

Received: 6 October 2020

Accepted: 12 January 2021

First Online: 15 February 2021

Ethics approval and consent to participate

: The present study was approved by the Research Ethics Committee of Golestan University of Medical Sciences (IR.GOUMS.1397.166) and performed entirely following the Declaration of Helsinki.. Written Informed consent was obtained from parents before the study.

: Not applicable.

: The authors declare no conflicts of interest.

: The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.