Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (PP00P1_163702)
Received: 27 January 2020
Accepted: 24 May 2020
First Online: 19 June 2020
Ethics approval and consent to participate
: This study protocol was approved by the Ethical Committee of Zurich (BASEC 2016–00773). Informed consent for study participation was obtained in written form from the participants.
: Not applicable.
: The authors declare that they have no competing interests.