Received: 3 March 2018
Accepted: 18 December 2018
First Online: 7 January 2019
: The author declares that they have no competing interests.
: The ethic approval was obtained from the Ethics Committee of Saveh University of Medical Sciences in Iran. In addition, both adolescents and their parents or legal guardians who accepted to participate in the study were asked to sign written informed consent forms for publication of data in an anonymous way.
: Not applicable.
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