Funding for this research was provided by:
National Natural Science Foundation of China (81602258, 81520108007, 31471195)
Natural Science Foundation of Shandong Province (ZR2018ZC1053)
National Key Research and Development Program of China (2016YFC0903400)
National Natural Science Foundation of China (CN) (81770869)
Shandong Province Key Research and Development Program (2018CXGC1207)
the Basic Application Research Plan of Qingdao (15-9-1-98-jch)
Text and Data Mining valid from 2019-09-02
Received: 27 January 2019
Accepted: 16 August 2019
First Online: 2 September 2019
Ethics approval and consent to participate
: The study was approved by the ethics committee of Affiliated Hospital of Qingdao University, and informed consents were obtained from all patients.
: Not applicable.
: The authors declare that they have no competing interests.