Funding for this research was provided by:
Swiss Medical Board (Unrestricted grant)
Received: 2 March 2020
Accepted: 23 November 2020
First Online: 27 November 2020
Ethics approval and consent to participate
: No ethical authorization was required for this type of study according to Swiss law. Since data were completely anonymized, no patient consent was necessary (The Human Research Act and the Ethics Committees for Research, Factsheet by the Coordination Office for Human Research (kofam), page 9: “Research projects with (…) anonymous health-related personal data are exempt from the requirement for approval” (ExternalRef removed)).
: Not applicable.
: The authors declare that they have no competing interests.