Szkandera, J
Herzog, S
Pichler, M
Stiegelbauer, V
Stotz, M
Schaberl-Moser, R
Samonigg, H
Asslaber, M
Lax, S
Leitner, G
Renner, W
Lenz, H-J
Berghold, A
Gerger, A
Article History
Received: 4 September 2014
Revised: 13 October 2014
Accepted: 2 December 2014
First Online: 10 February 2015
Competing interests
: The authors declare no conflict of interest.