Article History
Received: 16 November 2019
Accepted: 27 January 2020
First Online: 15 February 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interests.
: All procedures performed in current study involving human participants were in accordance with ethical standards of the institutional research committee and with the 1975 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by ethical committee of Bojnord Univertsity (No. 3925).
: In addition, all participants signed written informed consent form that was approved by ethical committee.