Funding for this research was provided by:
Shenzhen University grant (85304-00000282)
National Natural Science Foundation of China (11671373, 11671338)
Hong Kong Baptist University (FRG2/15-16/019, FRG1/16-17/018)
National Science Foundation grant (DMS-1507620)
Article History
Received: 18 November 2018
First Online: 19 June 2020
Compliance with ethical standards
:
: On behalf of all authors, the corresponding author states that there is no conflict of interest.