Received: 16 April 2020
Accepted: 3 August 2020
First Online: 12 August 2020
Ethics approval and consent to participate
: The study protocol and consent procedures were approved by the Regional Bioethics Committee for Biomedical Research (Nr. BE-2-25). All participants signed written informed consent with ability to discontinue participation at any time.
: Not applicable.
: The authors declare having no conflict of interest.