Wurster, K D
Hummel, F
Richter, J http://orcid.org/0000-0002-9543-4084
Giefing, M
Hartmann, S
Hansmann, M-L
Kreher, S
Köchert, K
Krappmann, D
Klapper, W
Hummel, M
Wenzel, S-S
Lenz, G
Janz, M
Dörken, B
Siebert, R
Mathas, S
Article History
Received: 19 January 2016
Revised: 2 August 2016
Accepted: 9 August 2016
First Online: 19 August 2016
Competing interests
: The authors declare no conflict of interest.