Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (FKZ:01ZP0505)
Text and Data Mining valid from 2019-01-18
Received: 27 April 2018
Accepted: 7 January 2019
First Online: 18 January 2019
Ethics approval and consent to participate
: This study and the BRENDA project have been approved by the ethics committee of the University of Ulm and were conducted accordint the Declaration of Helsinki. All participants consented in written to the study participation prior the data collection.
: not applicable.
: All authors declare that there are no potential conflicts of interest, including any financial, personal or other relationships with people or organizations that could inappropriately influence this work.
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