Funding for this research was provided by:
Received: 31 January 2020
Accepted: 10 July 2020
First Online: 31 July 2020
Ethics approval and consent to participate
: Our study does not contain nor collected patient level data. Therefore the medical ethical committee of the Netherlands Cancer Institute waived the need for formal ethical approval and indicated that obtaining informed consent was deemed unnecessary. However, each expert that was involved in the expert discussions was verbally asked for their consent and those invited for our questionnaire were asked by means of the questionnaire for their consent.
: Not applicable.
: None of the authors declared to have competing interest regarding the findings of our study.