Funding for this research was provided by:
National Natural Science Foundation of China (71734003)
Article History
Received: 18 August 2019
Accepted: 18 November 2019
First Online: 29 November 2019
Ethics approval and consent to participate
: The study was approved by the ethics committee of Tongji Medical College, Huazhong University of Science and Technology (IORG No: IORG0003571). Informed consent was obtained from the participants enrolled in the household survey, and the respondents were assured that their participation was voluntary and that they could withdraw from the study at any time.
: Not applicable
: The authors declare that they have no competing interests