Article History
Received: 20 August 2020
Accepted: 21 October 2020
First Online: 10 November 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: FR received speaker honoraria and travel grants from Intraop Medical and Lilly Germany, VV received institutional research grants from Varian Medical Systems, ViewRay Inc., Elekta, Merck-Serono and Roche. EM, SG and CR indicated no competing interests.