Forschbach, V
Goppelt-Struebe, M
Kunzelmann, K
Schreiber, R
Piedagnel, R
Kraus, A
Eckardt, K-U
Buchholz, B
Article History
Received: 30 April 2015
Revised: 11 August 2015
Accepted: 27 August 2015
First Online: 8 October 2015
Competing interests
: The authors declare no conflict of interest.