Klasvogt, Sonja
Zuschratter, Werner
Schmidt, Anke
Kröber, Andrea
Vorwerk, Sandra
Wolter, Romina
Isermann, Berend
Wimmers, Klaus http://orcid.org/0000-0002-9523-6790
Rothkötter, Hermann-Josef
Nossol, Constanze
Article History
Received: 14 November 2016
Revised: 7 December 2016
Accepted: 13 December 2016
First Online: 27 February 2017
Competing interests
: The authors declare no conflict of interest.