Text and Data Mining valid from 2019-09-03
Received: 5 May 2019
Accepted: 16 August 2019
First Online: 3 September 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of the Medical Faculty, University of Munich. Written consent was obtained from all surviving patients included in this study. In accordance with the ethics committee, the data from non-surviving patients were irreversibly anonymized for statistical evaluation.
: Not applicable.
: The authors declare that they have no competing interests.