Li, Li
Fan, Zhaomin
Wang, Haibo
Han, Yuechen
Funding for this research was provided by:
National Nature Science Foundation of China (81970873)
Article History
Received: 15 June 2020
Accepted: 4 January 2021
First Online: 8 January 2021
Ethics approval and consent to participate
: The ethical committee of Shandong Provincial ENT Hospital approved this observational study and waived the requirement for informed consent (Approval number: XYK20191201).
: Not applicable.
: The authors declare that they have no competing interests.