Brauckmann, Stephan
Effenberger-Neidnicht, Katharina
de Groot, Herbert
Nagel, Michael
Mayer, Christian
Peters, Jürgen
Hartmann, Matthias
Article History
Received: 29 July 2016
Accepted: 14 September 2016
First Online: 19 October 2016
Competing interests
: The authors declare no competing financial interests.