Funding for this research was provided by:
the National Natural Science Foundation of China (No. 11771076)
the Natural Science Foundation of Jiangsu Province (No. BK20141327)
China Postdoctoral Science Foundation (No. 2018M632385)
the Portuguese Funds through FCT (UID/MAT/00013/2013)
Article History
Received: 3 November 2017
Revised: 23 May 2018
Accepted: 24 May 2018
First Online: 5 June 2018