Text and Data Mining valid from 2018-09-03
Received: 25 April 2018
Accepted: 28 August 2018
First Online: 3 September 2018
Ethics approval and consent to participate
: All procedures performed in study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.All the participants signed informed consent forms which were approved by the ethics committee of Mashhad University of Medical Sciences (#89633–2011.08.29).
: Not applicable.
: The authors declare that they have no competing interests.
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