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Article History

Received: 8 February 2017

Accepted: 2 January 2018

First Online: 15 January 2018

Ethics approval and consent to participate

: The present study was accepted by the ethics committee of Mashhad University of Medical Science. Written informed consents were obtained from all the study participation. Moreover, they were assured that all the information would be kept confidential and would not be revealed unless for research purposes and in an anonymous form. Participants were allowed to decline participation at any stage of the investigation.

: Not applicable

: The authors declared no competing interests.

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