Nature Communications 5:5188; doi: 10.1038/ncomms6188 (2014); Published 21 Oct 2014; Updated 28 Jan 2015

In this Article Junyi Wang is incorrectly listed as one of several equally contributing authors. The correct list of equally contributing authors is: Huiguang Wu, Xuanmin Guang, Mohamed B. Al-Fageeh, Junwei Cao, Shengkai Pan and Huanmin Zhou.