Received: 23 April 2020
Accepted: 20 December 2020
First Online: 8 January 2021
Ethics approval and consent to participate
: The study was approved by the local Ethics Commission, Technical University Munich (No. 104/18S). A consent to participate is not applicable. Local tumor registry gave permission to use the given data.No further administrative permissions were required to access and use the data/records described.
: Not applicable.
: All authors declare no conflicts of interest that bias their work.