Received: 12 August 2020
Accepted: 13 November 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: Ethics approval for the study protocol was confirmed by The Human Ethics Committee of Tehran University of Medical Sciences (Ethics Number IR.TUMS.VCR.REC.1395.1597). All participants signed a written informed consent that was approved by the Ethics committee.
: Not applicable.
: All authors declared that they have no competing interests.