Deschler, Barbara
Ihorst, Gabriele
Schnitzler, Susanne
Bertz, Hartmut
Finke, Juergen
Article History
Received: 4 August 2017
Revised: 1 October 2017
Accepted: 25 October 2017
First Online: 12 January 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interests.