Funding for this research was provided by:
Natural Science Foundation of Shandong Province (No.ZR2016HP04, No.ZR2019MH062)
National Natural Science Foundation of China (No.81601020)
Text and Data Mining valid from 2020-01-03
Received: 21 July 2019
Accepted: 18 November 2019
First Online: 3 January 2020
Ethics approval and consent to participate
: This study was reviewed and approved by Institutional Review Board of Shandong Provincial Qianfoshan Hospital, Shandong University, and patient consent was acquired prior to the initiation of experiment.
: Not applicable.
: The authors declare that they have no competing interests.