Received: 18 September 2020
Accepted: 2 January 2021
First Online: 21 January 2021
Ethics approval and consent to participate
: The questionnaire, informed consent documents, and methodology for this study have been approved by the Ethikkommission Nordwest- und Zentralschweiz (Ethics approval number: 2017–02239). All participants gave written consent.
: Not applicable.
: The authors declare that they have no competing interests.