Funding for this research was provided by:
Kræftens Bekæmpelse (R90-A6150, R204-A12599)
Received: 22 December 2019
Accepted: 13 April 2020
First Online: 22 April 2020
Ethics approval and consent to participate
: The study was approved by the Danish Data Protection Agency (AHH-2014-042). According to the Danish regulations, anonymized registry studies are not subjected to ethical review.
: Not applicable.
: The authors declare that they have no competing interests.