Funding for this research was provided by:
wilhelm sander-stiftung (2019.162.1)
Received: 26 July 2021
Accepted: 10 January 2022
First Online: 31 January 2022
: This retrospective study was exempt from requiring ethics approval. Bavarian state law (Bayrisches Krankenhausgesetz/Bavarian Hospital Law §27 Absatz 4 Datenschutz (Dataprotection)) allows the use of patient data for research, provided that any person’s related data are kept anonymous. German radiation protection laws request a regular analysis of outcomes in the sense of quality control and assurance, thus in the case of purely retrospective studies no additional ethical approval is needed under German law.
: Not applicable.
: The Department of Radiation Oncology of the University Hospital of the LMU Munich has ongoing research agreements with Elekta Inc., Brainlab GmbH and ViewRay Inc.