Funding for this research was provided by:
National Natural Science Foundation of China (No. 81101453 and 81472159)
Text and Data Mining valid from 2019-12-01
Received: 19 July 2019
Accepted: 5 November 2019
First Online: 17 December 2019
Ethics approval and consent to participate
: Procedures were approved by the Chinese Institutional Animal Care Committee of Shandong University. Consent to participate is not applicable.
: Not applicable.
: The authors declare that they have no competing interests.