Funding for this research was provided by:
Natural Science Foundation of Shandong Province of China (ZR2016BM14)
Tai’an science and technology projectce Project (2016GX1046)
Postgraduate Foundation of Taishan University (Y2015-1-011)
Article History
Received: 22 May 2018
Accepted: 2 July 2018
First Online: 4 July 2018
Compliance with Ethical Standards
:
: The authors declare no conflict of interest.