Received: 25 March 2020
Accepted: 25 July 2020
First Online: 8 August 2020
Ethics approval and consent to participate
: Ethics approval for the study protocol was granted by The Human Ethics Committee of Tehran University of Medical Sciences (Grant ID: IR.TUMS.VCR.REC1395.1046). All participants signed written informed consent forms.
: Not Applicable.
: All authors declared that they have no competing interests.