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Authors
Clark, Alice
Prætorius, Thim
Török, Eszter
Hvidtfeldt, Ulla Arthur
Hasle, Peter
Rod, Naja Hulvej
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Article History
Received: 5 January 2021
Accepted: 5 May 2021
First Online: 31 May 2021
Declarations
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: The study was approved by the Danish Data Protection Agency through the joint notification of The Faculty of Health and Medical Sciences at The University of Copenhagen (record no 514–0531/20–3000). All data was handled according to GDPR guidelines. Survey-based studies do not require ethical approval by the Danish National Committee on Health Research Ethics according to Danish Law (Section 14, part 2) because ‘Notification of questionnaire surveys and medical database research projects to the system of research ethics committee system is only required if the project involves human biological material’ ().
: Not applicable.
: The research was supported by the Working Environment Research Fund, grant number 03–2013-09. All authors declare that they do not have any conflict of interest in the study.
