Text and Data Mining valid from 2019-02-08
Received: 19 October 2018
Accepted: 27 January 2019
First Online: 8 February 2019
Ethics approval and consent to participate
: This was conducted as part of a PhD thesis project at the Tehran University of Medical Sciences (TUMS). This study was approved by the School of Public Health & Allied Medical Sciences Ethics Committee; Tehran University of Medical Sciences (Ethics code: IR.TUMS.SPH.REC.1397.142). All participants were informed about the study and purposes and were ensured that all information collected will remain confidential. Every participant signed an informed consent form.
: Not applicable.
: The authors declare that they have no competing interests.
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