Voget, Sonja
Wemheuer, Bernd
Brinkhoff, Thorsten
Vollmers, John
Dietrich, Sascha
Giebel, Helge-Ansgar
Beardsley, Christine
Sardemann, Carla
Bakenhus, Insa
Billerbeck, Sara
Daniel, Rolf
Simon, Meinhard
Article History
Received: 24 April 2014
Revised: 17 June 2014
Accepted: 21 June 2014
First Online: 1 August 2014
Competing interests
: The authors declare no conflict of interest.