Funding for this research was provided by:
Natural Science Foundation of Shenzhen City (2014A030310056, JCY20140828163633985 and KQCX2015032416053646)
Hong Kong General Research Fund (Grant No. 701913)
Theme-based Research Scheme Project (T21-711/16-R)
Article History
Received: 26 February 2018
Revised: 5 May 2018
Accepted: 7 May 2018
First Online: 25 May 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.