Funding for this research was provided by:
Research Grants Council, University Grants Committee (GRF 17126914, HKU 784912)
Text and Data Mining valid from 2018-10-12
Received: 11 June 2018
Accepted: 2 October 2018
First Online: 12 October 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 by any of the authors. All applicable institutional guidelines set by the Committee on the Use of Live Animals in Teaching and Research (CULATR) of The University of Hong Kong for the care and use of animals were followed.
: For this type of study, formal consent is not required.