Funding for this research was provided by:
The Quality Foundation of the Dutch Association of Medical Specialists (Not applicable)
Received: 25 February 2020
Accepted: 4 May 2020
First Online: 11 May 2020
Ethics approval and consent to participate
: This study was approved by the scientific and privacy committee of PALGA (the nationwide registry of histo- and cytopathology in the Netherlands). As this study was performed retrospectively on anonymised data, and did not involve subjecting patients to anything, consent from the ethics committee was not required according to the Dutch law. All data from the PALGA database are pseudonymized by a trusted third party (ZorgTTP, Houten, The Netherlands). We only ever received fully anonymised data. Data of patients who object against the scientific use of their (anonymised) data are not included in the PALGA database. Therefore waiver of informed consent is applicable. All data were retrieved and handled in compliance with the General Data Protection Regulation (GDPR).
: Not applicable (see above).
: All authors declare that they have no conflict of interest.