Received: 8 April 2019
Accepted: 10 July 2019
First Online: 17 July 2019
Ethics approval and consent to participate
: Ethical clearance was obtained from the Ethics Committee of Zanjan University of Medical Sceinces before conducting the study (IR.ZUMS.REC.1396.278). All participants provided written informed consent to participate in the studies.
: Not applicable.
: The authors declare that they have no competing interests.