Received: 27 November 2019
Accepted: 24 August 2020
First Online: 7 October 2020
Ethics approval and consent to participate
: The study was approved by the ethics commission of ETH Zurich. All subjects gave signed, written informed consent in accordance with the Declaration of Helsinki before participating in the experiment.
: All participating subjects signed informed consent for this study and subsequent publications, and all identifying features were removed.
: The authors declare that they have no competing interests.