Received: 5 March 2020
Accepted: 16 June 2020
First Online: 22 June 2020
Ethics approval and consent to participate
: The study was approved by the regional ethics committee (Comité intercantonal d’éthique (Jura, Fribourg, Neuchâtel), number 01/2008<b>,</b> 24.09.2008. Written informed consent was obtained from all individual patients included in the study at each hospital site.
: Not applicable.
: The authors declare, that they have no competing interests.