Schmidt, Susanne
Altenburger, Rolf
Kühnel, Dana
Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (03X0131)
Article History
Received: 29 August 2017
Revised: 15 November 2017
Accepted: 17 November 2017
First Online: 11 December 2017
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.