Received: 6 March 2020
Accepted: 1 May 2020
First Online: 12 May 2020
Ethics approval and consent to participate
: According to the Central Committee on Research involving Human Subjects (CCMO), this type of observational study does not require approval from an ethics committee in the Netherlands. The Privacy Review Board of the Netherlands Cancer Registry approved the use of anonymous data for this study.
: Not applicable.