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Article History

Accepted: 17 February 2022

First Online: 26 February 2022

Declarations

:

: Funding for this article was received from Region Stockholm, ALF project number 573301 (EH, KW, LF), Department of Neonatology at Karolinska University Hospital, General Maternity Hospital Foundation, Samaritan Foundation for Paediatric Research, Lilla Barnets Fond (EH), and Sven Jerring Foundation (LF). The funders did not take part in conducting the research or writing the paper. Open access funding was provided by Karolinska Institute.

: EH, LF, UN, KW and KK declare that they have no competing interests.

: The study was approved by the Regional Ethical Review Board in Lund (dnr. 2013/342-31/5).

: Not applicable.

: Not applicable.

: Data from the Swedish registers are protected, but some aggregated data can be available on request from the authors.

: Not applicable.

: KK conceptualized and designed the study, was responsible for the data collection, carried out the initial analyses, and reviewed and revised the manuscript. EH conceptualized and designed the study and drafted the initial manuscript. UN, LF and KW conceptualized and designed the study and critically reviewed and revised the manuscript. All authors approved the final manuscript as submitted and agree to be accountable for all aspects of the work outlined in the manuscript.