Funding for this research was provided by:
the Natural Science Foundation of Shandong Province (ZR2017MEE066)
Article History
Received: 16 May 2018
Accepted: 19 November 2018
First Online: 3 December 2018
Statement
: This manuscript has not been published, simultaneously submitted or already accepted for publication elsewhere. All authors have read and approved the manuscript. There is no conflict of interest related to individual authors’ commitments and any project support. All acknowledged persons have read and given permission to be named. Xiulong Chen et al. have nothing to disclose.