Funding for this research was provided by:
National Natural Science Foundation of China (81874040, 81500029, 81371455)
Natural Science Foundation of Shandong Province (BS2015YY05)
Received: 16 November 2018
Accepted: 30 January 2019
First Online: 13 February 2019
Ethics approval and consent to participate
: The institutional review board of QiLu hospital had approved the study by using formalin-fixed tissue. The Institutional Animal Care and Use Committee (IACUC) was from Ethics Committee of Qilu Hospital of Shandong University.
: Not applicable.
: The authors declare that they have no competing interests.
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