Willasch, A M
Salzmann-Manrique, E
Krenn, T
Duerken, M
Faber, J
Opper, J
Kreyenberg, H
Bager, R
Huenecke, S
Cappel, C
Bremm, M
Pfirrmann, V
Merker, M
Ullrich, E
Bakhtiar, S
Rettinger, E
Jarisch, A
Soerensen, J
Klingebiel, T E
Bader, P
Article History
Received: 29 March 2016
Revised: 20 June 2016
Accepted: 19 July 2016
First Online: 19 September 2016
Competing interests
: The authors declare no conflict of interest.