Duan, Gui-Lan
Hu, Ying
Schneider, Sabine
McDermott, Joseph
Chen, Jian
Sauer, Norbert
Rosen, Barry P.
Daus, Birgit
Liu, Zijuan
Zhu, Yong-Guan
Article History
Received: 3 May 2015
Accepted: 16 November 2015
First Online: 21 December 2015
Competing interests
: The authors declare no competing financial interests.