Funding for this research was provided by:
Received: 9 May 2020
Accepted: 11 August 2020
First Online: 20 August 2020
Ethics approval and consent to participate
: The study has been approved by the ethics committee of the University of Lübeck (reference: 18–302). It is conducted in accordance with the principles of the Declaration of Helsinki and the principles of Good Clinical Practice (ICH-GCP E6). Patients are included after giving written informed consent.
: Not applicable.
: Dirk Rades is member of the editorial board of BMC Cancer. Otherwise, the authors declare that they have no competing interest related to the study presented here.