Funding for this research was provided by:
100-Talent Program of the Chinese Academy of Sciences (N/A)
Article History
Received: 1 June 2017
Revised: 27 December 2017
Accepted: 14 January 2018
First Online: 1 February 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with animals performed by any of 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.