Summerer, I
Unger, K
Braselmann, H
Schuettrumpf, L
Maihoefer, C
Baumeister, P
Kirchner, T
Niyazi, M
Sage, E
Specht, H M
Multhoff, G
Moertl, S
Belka, C
Zitzelsberger, H
Article History
Received: 9 December 2014
Revised: 19 February 2015
Accepted: 27 February 2015
First Online: 9 June 2015
Competing interests
: The authors declare no conflict of interest.