Article History
Received: 28 October 2020
Accepted: 24 May 2021
First Online: 25 June 2021
Declarations
:
: The study was submitted to the Ethics Committee of Xiangya School of Public Health, Central South University and was granted a waiver beacause this study used the data from 2012 National Chronic Disease Management Project and did not involve the human trial or personal information. Informed consent was obtained from the participants before the investigation.
: Not applicable because this study did not involve the disclosure of personal privacy information.
: No conflict of interest between the study and other commercial institutions or individuals.