Schulz, Solveig
Mensah, Martin A.
de Vries, Heike
Fröber, Rosemarie
Romeike, Bernd
Schneider, Uwe
Borte, Stephan
Schindler, Detlev
Kentouche, Karim http://orcid.org/0000-0001-9865-2629
Article History
Received: 29 September 2017
Revised: 31 January 2018
Accepted: 13 February 2018
First Online: 14 May 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.