Received: 30 November 2020
Accepted: 12 February 2021
First Online: 18 February 2021
Ethics approval and consent to participate
: The study was approved by the Cantonal Ethics Committee of Zurich, Switzerland (BASEC 2017–01630). The study has been performed in accordance with the Declaration of Helsinki. Written informed consent was obtained from all individual participants in the study.
: Not applicable.
: The authors declare that there is no competing interests.