Funding for this research was provided by:
National Natural Science Foundation of China (5140003)
Anhui Provincial Natural Science Foundation (1508085QE105)
Scientific Research Fund of Anhui Provincial Education Department (KJ2016A791, KJ2017A030)
Article History
Received: 9 October 2017
Accepted: 15 February 2018
First Online: 27 February 2018