Funding for this research was provided by:
National Natural Science Foundation of China (31871306, 31671300)
Text and Data Mining valid from 2019-07-29
Accepted: 11 July 2019
First Online: 29 July 2019
Disclosure of potential conflicts of interest
: None declared.
: This study was financially supported by the National Natural Science Foundation of China (31671300, 31871306), the Taishan Scholars Program of Shandong Province (tsqn20161060), the Science and Technology Development Project of Shandong Province (2016GSF201211) and the Shandong Health Department (2015WS0155).