Funding for this research was provided by:
Ministry of Health, Canton of Zurich
Received: 20 October 2020
Accepted: 27 January 2021
First Online: 15 February 2021
Ethics approval and consent to participate
: The study was reviewed by the Ethics Committee of the Canton of Zurich, which waived the need for approval (Req-2018-00107). Return of the questionnaire was taken as informed consent.
: Not applicable.
: The authors declare that they have no competing interests.