Scheiermann, Patrick
Bachmann, Malte
Härdle, Lorena
Pleli, Thomas
Piiper, Albrecht
Zwissler, Bernhard
Pfeilschifter, Josef
Mühl, Heiko
Article History
Received: 10 September 2014
Accepted: 22 January 2015
First Online: 17 February 2015
Competing interests
: The authors declare no competing financial interests.