Ma, Weichao
Cao, Weijia
Zhang, Bowen
Chen, Kequan
Liu, Quanzhen
Li, Yan
Ouyang, Pingkai
Article History
Received: 30 July 2015
Accepted: 29 September 2015
First Online: 22 October 2015
Competing interests
: This work has been included in a patent application by Nanjing Tech University.