Funding for this research was provided by:
National Natural Science Foundation of China (71673101, 71473096)
Received: 5 December 2018
Accepted: 7 July 2020
First Online: 11 July 2020
Ethics approval and consent to participate
: The data (NRCMS) used in this study was obtained from management organization of medical insurance with its permission, and all information related to inpatients privacy was not extracted. The research methods and investigation tools in this study were approved by the Ethics Committee of Tongji Medical College, Huazhong University of Science and Technology (IORG No: IORG0003571).
: Not applicable.
: The authors declare that they have no competing interests.