Funding for this research was provided by:
Academic and Technical Leader’s Foundation of Sichuan Province (2017-919-25)
Science Foundation of Sichuan Province (2018FZ0041)
Health and Family Planning Commission Foundation of Sichuan Province (17PJ236)
Received: 9 August 2019
Accepted: 25 November 2019
First Online: 10 December 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of West China Second University Hospital. Written informed consent was obtained from patients or their representatives for participation of this study.
: Not applicable.
: The authors declare no conflict of interest.