Received: 5 November 2019
Accepted: 30 January 2020
First Online: 7 February 2020
Ethics approval and consent to participate
: The local ethics committee of Hannover Medical School approved this study (3467–2017). No participant consent or parental consent was obtained due to the design of the study.
: Not applicable.
: The authors declare that they have no competing interests. Frank Wacker reports institutional grants from Siemens Healthineers, from Promedicus Ltd., institutional grants and personal fees from Delcath Systems, Inc., outside the submitted work.