Text and Data Mining valid from 2019-06-14
Received: 30 November 2018
Accepted: 5 June 2019
First Online: 14 June 2019
Ethics approval and consent to participate
: This study approved by the human research ethics committee of North Khorasan University of Medical Sciences (ethics code: IR.nkums.REC.1396.38).
: The authors are consent this manuscript has not been published elsewhere.
: The authors declare that they have no competing interests.