Received: 2 June 2021
Accepted: 5 November 2021
First Online: 15 December 2021
: Not applicable.
: The Research Ethics Committees of Peking University (number IRB00001052–13074) and Duke University granted approval for the CLHLS, including collections of questionnaire data with written informed consent before participation. The study was performed in accordance with the Declaration of Helsinki. This study only showed the secondary aggregated data, and we did not include any data of their personal information, including name, identity information, address, telephone number, etc. None of the authors in this study had access to identifying patient information during the analysis of the data.
: The authors declare that they have no competing interests.