Received: 2 November 2019
Accepted: 24 August 2020
First Online: 16 September 2020
Ethics approval and consent to participate
: Signed informed consent was obtained from all participants’ parents or legal guardians. The study was approved by the Research Institutional Review Committee of Islamic Azad University, Kazerun branch (reference 1398.125). Data for this study were collected retrospectively.
: Not applicable.
: The authors declare that they have no competing interests.