Li, Liping
Duan, Tingmei
Wang, Xin
Zhang, Ru-Hua
Zhang, Meifang
Wang, Suihai
Wang, Fen
Wu, Yuanzhong
Huang, Haojie
Kang, Tiebang
Article History
Received: 14 July 2015
Accepted: 1 December 2015
First Online: 5 February 2016
Competing interests
: The authors declare no competing financial interests.