Text and Data Mining valid from 2020-02-06
Received: 20 January 2019
Accepted: 23 January 2020
First Online: 6 February 2020
Ethics approval and consent to participate
: Informed written consent was taken from parents and/or patients and the study was approved by the ethical committee of Shahid Beheshti University of Medical Sciences with the ethics code of IR.SBMU.RETECH.REC.1396.937.
: Not applicable.
: The authors declare that they have no competing interests.