Bian, Qin
Jain, Amit
Xu, Xin
Kebaish, Khaled
Crane, Janet L.
Zhang, Zhendong
Wan, Mei
Ma, Lei
Riley, Lee H.
Sponseller, Paul D.
Guo, X. Edward
Lu, Willian Weijia
Wang, Yongjun
Cao, Xu
Article History
Received: 7 December 2015
Accepted: 12 May 2016
First Online: 3 June 2016
Competing interests
: The authors declare no competing financial interests.