Received: 19 September 2019
Accepted: 5 February 2020
First Online: 10 February 2020
Ethics approval and consent to participate
: The study was approved by the regional ethics committee of the Canton of Bern, Switzerland. Patients who refused to give the general consent for the use of their anonymised data were excluded from the study (KEK: 3841).
: Not applicable.
: The authors declare that they have no competing interests.