Schott, J W
Hoffmann, D
Maetzig, T
Müller, F-J
Steinemann, D
Zychlinski, D
Cantz, T
Baum, C
Schambach, A
Article History
Received: 17 January 2014
Revised: 16 May 2014
Accepted: 23 June 2014
First Online: 7 August 2014
Competing interests
: The authors declare no conflict of interest.