Funding for this research was provided by:
The outstanding youth talent support program for training excellent talents in Fangshan District, Beijing, China (2016000000007B001)
Received: 26 February 2020
Accepted: 12 June 2020
First Online: 18 June 2020
Ethics approval and consent to participate
: The Institutional Review Board of the Xiaotangshan Hospital approved this study (No. 202006). Only health examination information data was used for data analysis, so the requirement of informed consent from participants was waived.
: Not applicable.
: The authors declare that they have no competing interests.