Li, Zhengke
Jiang, Kui
Yang, Guofang
Lai, Joshua Yuk Lin http://orcid.org/0000-0002-2196-0719
Ma, Tingxuan
Zhao, Jingbo http://orcid.org/0000-0002-1143-482X
Ma, Wei http://orcid.org/0000-0002-7239-2010
Yan, He
Article History
Received: 18 April 2016
Accepted: 1 September 2016
First Online: 26 October 2016
Competing interests
: A patent application relevant to this work has been filed and submitted to United States Patent and Trademark Office by H.Y. and Z.L. All other authors declare no competing financial interests.