Text and Data Mining valid from 2019-10-15
Received: 16 July 2018
Accepted: 10 September 2019
First Online: 15 October 2019
Ethics approval and consent to participate
: Ethics approval was provided by the local ethics committee (cantonal ethics committee Zurich: 2015–0480), allowing this retrospective study with a many patients without the need for individually signed informed consent.
: Not applicable.
: The authors declare that they have no competing interests.