Received: 4 May 2020
Accepted: 25 August 2020
First Online: 1 September 2020
Ethics approval and consent to participate
: The study was reviewed and approved by Medical Ethics Committee of Qom University of Medical Sciences (Code: IR.MUQ.REC.1399.011). Participants provided written informed consent to participate in this study. In unconscious patients or those under mechanical ventilation, consent was obtained from the relatives of them.
: Not applicable.
: The authors declare that they have no competing interests.