Funding for this research was provided by:
National Natural Science Foundation of China (81303108)
Text and Data Mining valid from 2019-07-16
Received: 15 February 2019
Accepted: 6 July 2019
First Online: 16 July 2019
Ethics approval and consent to participate
: Written informed consent was obtained from each donor, and this study was approved by the ethics committee of Tianjin Medical University (IRB2018-YX-089).
: Not applicable.
: The authors declare that they have no competing interests.