Funding for this research was provided by:
National Natural Science Foundation of China (81301594)
Third Military Medical University, Southwest Hospital Fund (SWH2016LCYB-17)
Text and Data Mining valid from 2019-07-01
Received: 22 January 2019
Accepted: 7 May 2019
First Online: 1 July 2019
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of Southwest Hospital, the Third Military Medical University (Army Medical University). And all the donors and their families read and signed the informed consents.
: Not applicable.
: The authors declare that they have no competing interests.