Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2014A030306034)
Science and Technology Innovation Committee of Shenzhen (ZDSYS201604291912175)
Department of Education of Guangdong Province (2017KQNCX149)
Article History
Received: 25 June 2018
Accepted: 14 November 2018
First Online: 27 November 2018