Tsai, Ping-Ping
Schlichtig, Anja
Ziegler, Evira
Ernst, Heinrich
Haberstroh, Jörg
Stelzer, Helge D.
Hackbarth, Hansjoachim
Article History
Received: 31 March 2014
Accepted: 11 December 2014
First Online: 22 July 2015
Competing interests
: The authors declare no competing financial interests.