Received: 30 November 2020
Accepted: 27 May 2021
First Online: 10 June 2021
: The study was approved by the Ethics Committee of the Canton of Zurich, Switzerland and of the Canton of Bern, Switzerland and has therefore been performed in accordance with ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. All participants provided written informed consent prior to study participation.
: Not applicable.
: The authors declare that they have no competing interests.