Funding for this research was provided by:
Health Department of Sichuan Province (17ZD015)
West China Hospital, Sichuan University (2018HXFH037)
Received: 29 March 2020
Accepted: 22 July 2020
First Online: 5 August 2020
Ethics approval and consent to participate
: The investigation was approved by the Ethics Committee of West China Hospital, Sichuan University, which waived the need for informed consent because all the data used in this study were routinely obtained. The data used in this study was anonymised before its use.
: Not applicable.
: The authors declare no conflict of interest.