Xu, Xiaofeng
Hui, Dafeng
King, Anthony W.
Song, Xia
Thornton, Peter E.
Zhang, Lihua
Article History
Received: 21 July 2015
Accepted: 29 October 2015
First Online: 27 November 2015
Change Date: 14 January 2016
Change Type: Update
Change Details: The HTML version of this paper was updated shortly after publication, following a technical error that resulted in the link to the Supplementary Dataset being omitted. This has now been corrected; the PDF version of the paper was correct from the time of publication.
Competing interests
: The authors declare no competing financial interests.