Gu, Meichao http://orcid.org/0000-0003-1490-3326
Ni, Hemin
Sheng, Xihui
Pauciullo, Alfredo http://orcid.org/0000-0002-3140-9373
Liu, Yunhai
Guo, Yong
Article History
Received: 31 January 2017
Accepted: 22 June 2017
First Online: 27 July 2017
Competing Interests
: The authors declare that they have no competing interests.