Funding for this research was provided by:
Medizinische Hochschule Hannover (MHH)
Received: 21 July 2021
Accepted: 10 January 2022
First Online: 31 January 2022
: The ethics committee of the Hannover Medical School approved the study (number 8949_BO_K_2020). The staff and the local employee representative committee agreed to the observation.
: Not applicable (No individual details such as images or videos are included).
: The authors declare that they have no competing interests.
: The results of this study have partly been presented at the 73rd Annual Conference of the German Society for Hygiene and Microbiology.