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Authors
Balmer, Lisa
Seth-Smith, Helena M. B.
Egli, Adrian
Casanova, Carlo
Kronenberg, Andreas
Schrenzel, Jacques
Marschall, Jonas
Sommerstein, Rami https://orcid.org/0000-0003-1011-6878
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Article History
Received: 29 July 2020
Accepted: 20 February 2022
First Online: 9 March 2022
Declarations
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: According to federal law, outbreak investigations are considered quality improvement projects and are therefore exempt from ethical approval []. The nationwide investigation was supported in part by the Federal Office of Public Health ().
: Not applicable.
: The authors declare that they have no competing interests.
: None to declare.
