Funding for this research was provided by:
Hong Kong Baptist University (38-40-088, FRG2/15-16/037)
Hong Kong Baptist University (FRG1/14-15/037, FRG1/15-16/015, FRG2/13-14/075)
Hong Kong Research Grants Council (ECS-209813, GRF-12311416)
National Natural Science Foundation of China (NSFC-21303151, NSFC-21673199)
Article History
Received: 8 May 2018
Accepted: 25 September 2018
First Online: 8 October 2018