Funding for this research was provided by:
Tehran University of Medical Sciences and Health Services (93-01-161-25470)
Received: 11 March 2017
Accepted: 12 September 2017
First Online: 29 September 2017
Ethics approval and consent to participate
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki, and all procedures involving human subjects were approved by the Ethics Committee of Tehran University of Medical Sciences.
: Not applicable.
: The authors declare that they have no competing interests.
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