Received: 4 July 2021
Accepted: 17 May 2022
First Online: 3 June 2022
: The CLDS 2016 has got the approval for interviewing respondents by the Biomedical Ethics Review Committee of Yat-sen University, and the informed consent was required to sign by the participants (available online: ExternalRef removed<u>).</u> The study methodology was carried out in accordance with approved guidelines.
: Not applicable.
: The authors declare that they have no competing interests.