Text and Data Mining valid from 2019-08-30
Received: 31 July 2018
Accepted: 4 August 2019
First Online: 30 August 2019
Compliance with ethical standards
: All authors declare that there is not any kind of conflict of interests<b>.</b>
: Participation in the survey was voluntary. The participants entered the survey after explaining the study objectives and protocols and obtaining oral assent from students and written consent from their parents. The research ethics committee of the Endocrine and Metabolism Research Center (EMRC) from Tehran University of Medical Sciences and ethics boards of Isfahan University of Medical Sciences approved the study protocol. All questionnaires and checklists were completed anonymously.