Zeng, Lingping
Collins, Kimberlee C.
Hu, Yongjie
Luckyanova, Maria N.
Maznev, Alexei A.
Huberman, Samuel
Chiloyan, Vazrik
Zhou, Jiawei
Huang, Xiaopeng
Nelson, Keith A.
Chen, Gang
Article History
Received: 19 August 2015
Accepted: 26 October 2015
First Online: 27 November 2015
Competing interests
: The authors declare no competing financial interests.