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