Heinzelmann, F
Bethge, W
Beelen, D W
Engelhard, M
Kröger, N
Dreger, P
Niederwieser, D
Finke, J
Bunjes, D
Tischer, J
Kobbe, G
Holler, E
Bornhäuser, M
Stelljes, M
Baurmann, H
Müller, A
Haubitz, I
Schrezenmeier, H
Müller, C
Ottinger, H
Article History
Received: 12 May 2015
Revised: 3 December 2015
Accepted: 5 December 2015
First Online: 8 February 2016
Competing interests
: The authors declare no conflict of interest.