Funding for this research was provided by:
Taishan Scholar Project of Shandong Province (ts20190983)
Article History
Received: 10 September 2019
Accepted: 6 January 2020
First Online: 3 February 2020
Competing interests
: All co-authors declare that no financial or non-financial competing interests or conflict exits in the submission of this manuscript. This research was supported by the Key Science and Technology Innovation Project of Shandong Province (2018CXGC1205), the Taishan Scholar Program (ts20190983), and the Innovation Project of Shandong Academy of Medical Sciences.