Yu, Li-Qing
Wang, Li-Ya
Su, Fei-Hong
Hao, Ping-Yu
Wang, Huan
Lv, Yun-Kai
Funding for this research was provided by:
The National Natural Science Foundation of China (21375032, 21505031)
The Natural Science Foundation of Hebei Province (B2016201210, B2016201213)
Article History
Received: 25 January 2018
Accepted: 10 May 2018
First Online: 22 May 2018
Compliance with ethical standards
: The author(s) declare that they have no competing interests.