Funding for this research was provided by:
National Natural Science Foundation of China (31700065)
the Shandong Provincial Natural Science Foundation (ZR2017BC040)
the Innovation Project of the Shandong Academy of Medical Sciences (201604)
Text and Data Mining valid from 2019-07-27
Received: 20 June 2019
Accepted: 20 July 2019
First Online: 27 July 2019
Ethics approval and consent to participate
: No animal or human subjects were used in this work.
: Not applicable.
: The authors declare that they have no competing interests.