Kap, E J
Seibold, P
Richter, S
Scherer, D
Habermann, N
Balavarca, Y
Jansen, L
Becker, N
Pfütze, K
Popanda, O
Hoffmeister, M
Ulrich, A
Benner, A
Ulrich, C M
Burwinkel, B
Brenner, H
Chang-Claude, J
Article History
Received: 29 September 2014
Revised: 21 November 2014
Accepted: 28 January 2015
First Online: 17 March 2015
Competing interests
: The authors declare no conflict of interest.