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Article History

Received: 16 February 2023

Accepted: 19 May 2023

First Online: 2 June 2023

Declarations

:

: The authors declare that they have no competing interests.

: Each participating country was responsible for and obtained ethical approval for the CP-North research program in accordance to their local laws and regulations [CitationRef removed].Data were collected from each program in an aggregated form and therefore it is not possible to link the data to any specific individual. Each program has ethical approval for the CPNorth research program in accordance to their local laws and regulations: CPUPSweden; Regional Ethics Board, Lund 2018/491. CPOPNorway; Regional Committees for Medical and Health Research Ethics 2017/2457/REK Southeast. CPIPSScotland; South East Scotland Research Ethics Service confirmed that ethical review was not required. Finland; the Helsinki University Hospital Ethical Committee IV HUS 3640/2017. Denmark; the Danish Data protection Agency approved the study, reference number 2016–051 − 000001, serial number 1774. Iceland; the National Bioethics Committee in Iceland, VSN-19–140. This study is based entirely on register data, with the exception for Finland. The participants verbally agree to participate in respective program. They are informed that data are being registered in the national registers and that the data can be used for research purposes. It is possible to “opt in” to the follow-up program but “opt out” from data being registered or used for research. None of the national ethics committees has deemed written or oral approval for participation necessary. All methods were carried out in accordance with relevant guidelines and regulations in the Declaration of Helsinki.

: Not applicable.