Rong, Yaoguang http://orcid.org/0000-0003-4794-8213
Hou, Xiaomeng
Hu, Yue
Mei, Anyi http://orcid.org/0000-0002-8142-853X
Liu, Linfeng
Wang, Ping
Han, Hongwei
Article History
Received: 9 November 2016
Accepted: 11 January 2017
First Online: 27 February 2017
Competing interests
: The authors declare no competing financial interests.