Funding for this research was provided by:
Innovative Research Group Project of the National Natural Science Foundation of China (81672201 and 81871794)
Text and Data Mining valid from 2020-01-07
Received: 19 November 2019
Accepted: 24 December 2019
First Online: 7 January 2020
Ethics approval and consent to participate
: This study was approved by the Ethical committee of Beijing Xuanwu Hospital. Each participant gave written, informed consent to participate.
: Consent for publish potentially-identifying information of patients was obtained written.
: The authors declare that they have no competing interests.