Yu, Guoqiang
Akyol, Mustafa
Upadhyaya, Pramey
Li, Xiang
He, Congli
Fan, Yabin
Montazeri, Mohammad
Alzate, Juan G.
Lang, Murong
Wong, Kin L.
Khalili Amiri, Pedram
Wang, Kang L.
Article History
Received: 2 September 2015
Accepted: 15 March 2016
First Online: 6 April 2016
Competing interests
: The authors declare no competing financial interests.