Funding for this research was provided by:
China Scholarship Council
Article History
Received: 31 August 2017
Revised: 21 September 2018
Accepted: 26 September 2018
First Online: 11 October 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed by the authors.
: All necessary permits for sampling and observational field studies have been obtained by the authors from the competent authorities and are mentioned in the acknowledgements, if applicable.