Li, Xiaoyu
Xiong, Xushen
Yi, Chengqi
Article History
Received: 25 August 2016
Accepted: 28 November 2016
First Online: 29 December 2016
Change Date: 10 February 2017
Change Type: Erratum
Change Details: In the version of this article initially published, author affiliation numbers were incorrect. Xiaoyu Li originally had affiliation 1; this has been changed to affiliations 1 and 2. Xushen Xiong originally had affiliations 1 and 2; these have been changed to affiliations 1–3. Chengqi Yi originally had affiliations 1 and 3; these have been changed to affiliations 2 and 4. The error has been corrected in the HTML and PDF versions of the article.
Competing interests
: The authors declare no competing financial interests.