Text and Data Mining valid from 2018-10-12
Received: 26 June 2018
Accepted: 26 September 2018
First Online: 12 October 2018
Ethics approval and consent to participate
: The ethical approval for performing this study was obtained from the Ethics Committee of the Mashhad University of Medical Sciences (Ethics code of IR.mums.fm.rec.1397.143) and written informed consent was obtained from participants.
: The authors declare that they have no competing interests.
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