Funding for this research was provided by:
the National Natural Science Foundation of China (61573332, 61601431)
the Fundamental Research Funds for the Central Universities (WK2100100028)
the Anhui Provincial Natural Science Foundation (1708085QF141)
the General Financial Grant from the China Postdoctoral Science Foundation (2016M602032)
Article History
Received: 15 December 2017
Accepted: 3 December 2018
First Online: 1 January 2019
Compliance with ethical standards
:
: The authors declare that there is no conflict of interests regarding the publication of this paper.