Sandhöfer, N
Metzeler, K H
Rothenberg, M
Herold, T
Tiedt, S
Groiß, V
Carlet, M
Walter, G
Hinrichsen, T
Wachter, O
Grunert, M
Schneider, S
Subklewe, M
Dufour, A
Fröhling, S
Klein, H-G
Hiddemann, W
Jeremias, I
Spiekermann, K
Article History
Received: 17 April 2014
Revised: 26 September 2014
Accepted: 2 October 2014
First Online: 17 October 2014
Competing interests
: The authors declare no conflict of interest.