Acknowledgments
The authors would like to thank the Finnish Cancer Registry for providing data for this study.
Ethical approval
The design of the ALiCCS study was originally approved by national bioethics committees, data protection authorities, or the national institutes for health and welfare in each country (Denmark: 2010-41-4334, Finland: THL/520/5.05.00/2016, Norway: REC 2011/884 and Sweden: Ö 10-2010, 2011/19). With reference to the EU General Data Protection Regulation, the research project is listed in a local database at the Danish Cancer Society (2019-DCRC-0053), where all active research projects using personal data must be archived.
Disclosure statement
The authors report there are competing interests to declare.
Authors’ contributions
AA: Conceptualization, Methodology, Writing-Original draft preparation, Writing-Reviewing, and Editing. FNN: Funding, Conceptualization, Methodology, Acquisition of data, Writing-Reviewing, and Editing. MK: Methodology, Formal analysis, Writing-Reviewing, and Editing. TTN: Data management, Interpretation of data, Writing-Reviewing, and Editing. ASH: Acquisition of data, Interpretation of data, Writing-Reviewing, and Editing. IØ: Acquisition of Data, Interpretation of data, Writing-Reviewing, and Editing. KV: Acquisition of Data, Interpretation of data, Writing-Reviewing, and Editing. HØ: Acquisition of Data, Writing-Reviewing, and Editing. HH: Acquisition of Data, Writing-Reviewing, and Editing. CR: Conceptualization, Interpretation of data, Writing-Reviewing, and Editing. JFW: Conceptualization, Interpretation of data, Writing-Reviewing, and Editing. LK: Conceptualization, Methodology, Formal analysis, Interpretation of data, Supervision, Writing-Reviewing, and Editing. All authors have approved the final version.
Data availability statement
The data that support the findings of this study are available from different national services (Denmark: Sundhedsdatastyrelsen, Finland: TLH National Institute for Health and Welfare in Finland, Norway: The Cancer Registry of Norway, with an application through the Norwegian Health Data service; Sweden: The National Board of Health and Welfare) but restrictions apply to the availability of these data, which were used under license for the current study, and so are not publicly available. However, the study group welcomes collaboration with other researchers using our registry data. For further information regarding collaboration, please contact Line Kenborg ([email protected])