Received: 4 April 2020
Accepted: 28 October 2020
First Online: 27 November 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of the Medical Faculty of the ZAUMS Zahedan (IR.ZAUMS.REC.1398.210), and all procedures were in accordance with the latest version of the Declaration of Helsinki. Prior to participation, written informed consent was obtained from all participants and their parents/legal guardians after a comprehensive explanation of the study procedures.
: Not applicable.
: The author declares that he has no competing interests.