Puhr, M
Hoefer, J
Eigentler, A
Dietrich, D
van Leenders, G
Uhl, B
Hoogland, M
Handle, F
Schlick, B
Neuwirt, H
Sailer, V
Kristiansen, G
Klocker, H
Culig, Z
Article History
Received: 1 April 2015
Revised: 10 June 2015
Accepted: 6 July 2015
First Online: 10 August 2015
Competing interests
: The authors declare no conflict of interest.