Feldberg, Kathrin
Schneider, Harald
Stadler, Tanja
Schäfer-Verwimp, Alfons
Schmidt, Alexander R.
Heinrichs, Jochen
Article History
Received: 23 April 2014
Accepted: 21 July 2014
First Online: 7 August 2014
Competing interests
: The authors declare no competing financial interests.