Thaler, S
Haritoglou, C
Schuettauf, F
Choragiewicz, T
May, C A
Gekeler, F
Fischer, M D
Langhals, H
Schatz, A
Article History
Received: 26 February 2014
Accepted: 2 October 2014
First Online: 19 December 2014
Competing interests
: The authors declare no conflict of interest.