Sandvei, Marie Søfteland http://orcid.org/0000-0002-8972-8254
Pinborg, Anja
Gissler, Mika
Bergh, Christina
Romundstad, Liv Bente
van Leeuwen, Flora E.
Spaan, Mandy
Tiitinen, Aila
Wennerholm, Ulla-Britt
Henningsen, Anna-Karina
Opdahl, Signe
Funding for this research was provided by:
Kreftforeningen (182356–2016, 182356–2016)
The Norwegian Cancer Society
Article History
Received: 5 April 2022
Revised: 21 November 2022
Accepted: 29 November 2022
First Online: 22 December 2022
Competing interests
: The authors declare no competing interests.
: This study was approved by the registry-keeping authorities in each country. Permission was granted from the regional ethics committees in Norway (REC North 2010/1909) and Sweden (Dnr 214-12, T422-12, T516-15, T233-16, T300-17, T1144-17, T121-18, T1071-18, T2019 02347). In Denmark and Finland, study-specific ethical approval is not required when using national registry data for research purposes.
: Non applicable.