Ethics approval and consent to participate
This article was a part of the MSc thesis and approved by the Ethics Committee of the Vice Chancellor for Research of Zanjan University of Medical Sciences, Iran, with the approval number IR.ZUMS.REC.1399.132. All procedures of the study were by the protocol of the regional ethical research committee and with the declaration of Helsinki 1964. After informing the study’s purposes, written informed consent was obtained for study participation. They were informed that their participation was voluntary, confidential, and anonymous, and was apprised of their right to withdraw from the research at any time.