Author Contributions: Dr Terkelsen had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Terkelsen, Maeng, Trautner, Thuesen, Lassen.
Acquisition of data: Terkelsen, Sørensen, Jensen, Tilsted, Trautner, Lassen.
Analysis and interpretation of data: Terkelsen, Sørensen, Maeng, Trautner, Vach, Johnsen, Lassen.
Drafting of the manuscript: Terkelsen, Sørensen, Jensen, Thuesen, Lassen.
Critical revision of the manuscript for important intellectual content: Terkelsen, Sørensen, Maeng, Jensen, Tilsted, Trautner, Vach, Johnsen, Lassen.
Statistical analysis: Terkelsen.
Obtained funding: Terkelsen, Sørensen, Lassen.
Administrative, technical, or material support: Terkelsen, Sørensen, Jensen, Trautner, Lassen.
Study supervision: Maeng, Jensen, Tilsted, Johnsen, Thuesen, Lassen.
Financial Disclosures: Dr Sørensen reported receiving an unrestricted grant from Falck EMS, Denmark, to perform studies unrelated to the present study. No other authors reported disclosures.
Funding/Support: This study was supported by grants from the Helga and Peter Kornings Foundation, Aarhus, Denmark (J.No. 40-134918) and the Health Research Fund of Central Denmark Region, Aarhus, Denmark (J.No. 1-45-72-1-08).
Role of the Sponsors: The funders had no role in the design and conduct of the study, in the collection, management, analysis, and interpretation of the data, or in the preparation of the manuscript.
Additional Contributions: We thank Tim Lash, DSc, MPH, Department of Epidemiology, Aarhus University, Aarhus, Denmark, for his advice during the revision of the manuscript. Dr Lash received no compensation for his contributions.