Received: 19 May 2020
Accepted: 20 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: Ethics committee of Tehran University of Medical Sciences has approved the study, its ethical code is IR.TUMS.VCR.REC.1399.001 and approval was granted on March 22 , 2020 . I certify that this trial has received ethical approval from the appropriate ethical committee as described above. Written consent is obtained from participants to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.