Wang, Mo-Jin
Ping, Jie
Li, Yuan
Adell, Gunnar
Arbman, Gunnar
Nodin, Bjorn
Meng, Wen-Jian
Zhang, Hong
Yu, Yong-Yang
Wang, Cun
Yang, Lie
Zhou, Zong-Guang
Sun, Xiao-Feng
Article History
Received: 17 March 2015
Accepted: 24 April 2015
First Online: 27 May 2015
Competing interests
: The authors declare no competing financial interests.