Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (160107)
Received: 13 January 2020
Accepted: 2 September 2020
First Online: 3 September 2020
Ethics approval and consent to participate
: The study received ethical approval from the Kantonale Ethikkommission Bern (KEK), 3010 Bern, Switzerland (study number 2016–00417). Prior to the study all participants gave written informed consent before enrolment, according to the Declaration of Helsinki.
: Not applicable.
: No competing interests to declare.