Liu, L. L.
Feng, W. J.
Funding for this research was provided by:
the Training Program for Leading Talent in Hebei Province (A2017010004)
the Youth Fund of Education Department of Hebei Province (QN2015093)
the General Research Fund of Hong Kong (HKU 17223916)
the National Natural Science Foundation of China (10772123, 11072160)
the National Natural Science Foundation of China (11572358)
Article History
Received: 31 May 2018
Accepted: 12 September 2018
First Online: 25 September 2018