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Article History

Received: 6 July 2018

Accepted: 4 February 2020

First Online: 11 February 2020

Ethics approval and consent to participate

: Because no patient data or relevant data from student examinations or tests have been used, the ethics committee of the University Medical Center Göttingen informed us that only an “ethic request” without formal ethic-application was necessary and approved our study (application number: 24/7/14An).Participants gave written informed consent (see methods).

: Not applicable.

: All authors (DL, AS, YG) declare: they did not receive any financial support for the submitted work from anyone other than their employer; have no financial relationships with commercial entities that might have an interest in the submitted work, and no non-financial interests that may be relevant to the submitted work.