Article History
Received: 19 April 2020
Accepted: 14 August 2020
First Online: 18 August 2020
Compliance with ethical standards
:
: There is no conflict of interest. This research was carried out without any funds and was extracted from the thesis for the Doctorate of Medicine degree at the Medical School of Tehran University of Medical Sciences (thesis number: 23852). Amir Alam Hospital selected as the study environment just for being the referral otorhinolaryngology medical center.
: It is allowed by the ethical committee approval of Tehran University of Medical Sciences with code of IR.TUMS.MEDICINE.REC.1397.218.