Gao, Hongwei
Liu, Xin
Sun, Wen
Kang, Naixin
Liu, Yanli
Yang, Shilin
Xu, Qiong-ming
Wang, Chunming http://orcid.org/0000-0001-9185-9678
Chen, Xiuping
Article History
Received: 17 April 2017
Revised: 28 June 2017
Accepted: 2 July 2017
First Online: 17 August 2017
Competing interests
: The authors declare no conflict of interest.