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Article History

Received: 20 January 2021

Accepted: 1 December 2021

First Online: 12 January 2022

Declarations

:

: The project was unconditionally approved by the Medical Ethics Commission II at the Mannheim Medical Faculty of the Heidelberg University (2018-646 N-MA from 20th Nov 2018). In particular, the aforementioned ethics committee confirmed that an informed consent from the restaurant guests was not necessary under German data protection law, as no individual personal data of the guests or other persons were collected, nor were guests questioned or observed in any way. According to German jurisdiction, this was therefore not a study on or with human beings (Sect. 3 (1ff.) German Federal Data Protection Act (BDSG)). All necessary written informed consent forms were available for the pre-test.

: Not applicable.

: The authors declare that they have no competing interests.