Funding for this research was provided by:
Nordforsk, Nordic Programme on Health and Welfare; NordicWelfAir: 75007
Received: 17 February 2020
Revised: 11 August 2020
Accepted: 26 August 2020
First Online: 17 September 2020
Ethics approval and consent to participate
: This study is entirely register-based, involved no contact with members of the study population and published results does not allow identification of individuals. The analyses were undertaken in the secure IT environment of Statistics Denmark from where no individual level data can be retrieved. According to Danish legislation, no ethical approval of such a study is required. The study complied with the regulations of the Danish Data Protection Agency and EU (GDPR).
: Data are located at the secure IT environment at Statistics Denmark. Access to the data of Statistics Denmark can be obtained if approved by Statics Denmark. Requirements include compliance with the EU General Data Protection Regulation and the Danish Data Protection Act.
: The authors declare no competing interest.
: The research was funded by Nordforsk under the Nordic Programme on Health and Welfare (Project #75007: NordicWelfAir - Understanding the link between Air pollution and Distribution of related Health Impacts and Welfare in the Nordic countries). The funding source had no involvement in the study design, collection, analysis, interpretation, writing and decision to submit for publication. NORDFORSK is a research funding organisation under the Nordic governments.