Funding for this research was provided by:
National Basic Research Program of China (973 Program) (2017YFC0908800)
Beijing Municipal Administration of Hospitals (DFL20150601)
Beijing Municipal Administration of Hospitals’ Mission Plan (SML20180601)
Beijing Municipal Health Commission - “Project of Science and Technology Innovation Center” (PXM2019_026272_000006, PXM2019_026272_000005)
Text and Data Mining valid from 2020-03-10
Received: 13 December 2019
Accepted: 24 February 2020
First Online: 10 March 2020
Ethics approval and consent to participate
: This study was approved by the institutional review board of Beijing Anzhen Hospital, Capital Medical University. Given the retrospective nature of this study, the requirement for informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.