Text and Data Mining valid from 2019-07-13
Received: 30 May 2019
Accepted: 4 July 2019
First Online: 13 July 2019
Ethics approval and consent to participate
: The present study was provided from the medical student thesis (ID number: 2398). Ethics approval was obtained from the institutional review board of Iran University of Medical Sciences according to Helsinki declaration.
: All participants’ parents gave written consent before enrollment.
: The authors declare no conflict of interest.