Funding for this research was provided by:
Nordisk Ministerråd (75007)
Received: 4 March 2020
Accepted: 24 June 2020
First Online: 8 July 2020
Ethics approval and consent to participate
: The study was entirely register-based and did not require any contact with participants and published results does not allow identification of individual. Therefore, in accordance with Danish law, no ethical approval or consent from participants was required. The study complied with the regulations of the Danish Data Protection Agency and EU (GDPR).
: Not applicable.
: The authors declare that they have no competing interests.