Received: 13 May 2020
Accepted: 30 September 2020
First Online: 15 October 2020
Ethics approval and consent to participate
: The protocol was approved in September 2016 by Swissethics under the ID number BASEC 2016–01455 without requiring any administrative permission to use the data. Concerning retrospective data collection, no formal consent to participate was necessary.
: Not applicable.
: The authors declare that they have no competing interests.