Received: 4 July 2019
Accepted: 15 October 2019
First Online: 1 November 2019
Ethics approval and consent to participate
: Investigations on archived tissue and anonymized data were approved by the Charité Ethics Committee (Ethikkomission der Charité - Universitätsmedizin Berlin), decision №. EA1/370/16.All patients provided written consent to further investigate their tissue samples as well as the anonymous use of their clinical data.
: Not applicable.
: The authors declare that they have no competing interests.