Heist, Stefan
Dietrich, Patrick
Landmann, Martin
Kühmstedt, Peter
Notni, Gunther
Tünnermann, Andreas
Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (03ZZ0436, 03ZZ0436)
Article History
Received: 23 February 2018
Revised: 7 September 2018
Accepted: 7 September 2018
First Online: 3 October 2018
Conflict of interest
: The authors declare that they have no conflict of interest.