Li, Da-Hong
Li, Chen-Xi
Jia, Cui-Cui
Sun, Ya-Ting
Xue, Chun-Mei
Bai, Jiao
Hua, Hui-Ming
Liu, Xiao-Qiu
Li, Zhan-Lin
Article History
Received: 22 September 2015
Accepted: 24 November 2015
First Online: 10 December 2015
Compliance with ethical standards
:
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.