Article History
Received: 21 September 2020
Accepted: 13 January 2021
First Online: 22 January 2021
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of Shandong Otolaryngological Hospital Affiliated to Shandong University.
: All patients gave written informed consent before participation in this study.
: All participants have consented to the submission of this study to the journal.
: Not applicable.