Due to a misunderstanding, the authors' names were incorrectly provided in the published article as
Qingqing Q. Xu, Jue Qiu, Zhekun K. Zhou and Jianhua H. Jin
and in the citation as:
Xu QQ, Qiu J, Zhou ZK and Jin JH (2015).
The correct names are:
Qingqing Xu, Jue Qiu, Zhekun Zhou and Jianhua Jin
and the citation:
Xu Q, Qiu J, Zhou Z and Jin J (2015).
The original article has been updated.
Conflict of interest statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.