Oliver Metzig, M
Fuchs, D
Tagscherer, K E
Gröne, H-J
Schirmacher, P
Roth, W
Article History
Received: 20 April 2015
Revised: 3 August 2015
Accepted: 22 August 2015
First Online: 2 November 2015
Competing interests
: The authors declare no conflict of interest.