Peng, Xudong
Zhao, Guiqiu
Lin, Jing
Qu, Jianqiu
Zhang, Yingxue
Li, Cui
Funding for this research was provided by:
National Natural Science Foundation of China (No. 81470609, No. 81170825)
Natural Science Foundation of Shandong Province (ZR2013HQ007, ZR2012FZ001)
Article History
Received: 12 December 2017
Accepted: 6 July 2018
First Online: 13 July 2018
Ethics approval and consent to participate
: This study followed the tenets of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.
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