Received: 22 November 2020
Accepted: 23 March 2021
First Online: 17 April 2021
: Before the audiometric testing and medical examination, all the participants had read the informed consent form. Written consents were received from all participants, and this study was approved by the Ethics Committees of West China School of Public Health and West China Fourth Hospital (<i>No.</i>HXSY-EC-2020090). The study was performed in accordance with the ethical standards of the Declaration of Helsinki.
: Not Applicable.
: The authors declare that they have no competing interests.