Study concept and design: Wissenberg, Lippert, Folke, Christensen, Olesen, Gislason, Torp-Pedersen.
Acquisition of data: Wissenberg, Lippert, Folke, Jans, P. A. Hansen, Lang-Jensen, Nielsen, Torp-Pedersen.
Analysis and interpretation of data: Wissenberg, Lippert, Weeke, C. M. Hansen, Christensen, Jans, Olesen, Lindhardsen, Fosbol, Nielsen, Gislason, Kober.
Drafting of the manuscript: Wissenberg, Folke, C. M. Hansen.
Critical revision of the manuscript for important intellectual content: All Authors.
Statistical analysis: Wissenberg, C. M. Hansen, Olesen, Lindhardsen, Fosbol, Gislason.
Obtained funding: Wissenberg, Lippert, Kober.
Administrative, technical, or material support: Folke, Christensen, Jans, P. A. Hansen, Lindhardsen, Nielsen, Gislason, Torp-Pedersen.
Study supervision: Lippert, Folke, Christensen, Jans, Lang-Jensen, Gislason, Kober.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Lippert reported serving as a board member for TrygFonden. Dr Olesen reported receiving grants or grants pending from The Lundbeck Foundation and receiving travel expenses from AstraZeneca and Boehringer Ingelheim. Dr Kober reported receiving payment for speaking at a symposium arranged by Servier. Dr Torp-Pedersen reported serving as a consultant for Cardiome, Merck, Sanofi, and Daiichi and receiving grants or grants pending from Bristol-Myers Squibb. No other authors reported disclosures.
Funding/Support: This study was supported by the Danish foundation TrygFonden, the Danish Heart Foundation, and the Health Insurance Foundation (all from Denmark). The Danish Cardiac Arrest Registry and the Automated External Defibrillator (AED) Network are supported by TrygFonden, which has no commercial interests in the field of cardiac arrest. Dr Gislason is supported by an independent research scholarship from the Novo Nordisk Foundation.
Role of the Sponsors:The study sponsors had no role in the design and conduct of the study; the collection, management, analysis, or interpretation of the data; the preparation, review, or approval of the manuscript; or the decision to submit the manuscript for publication.
Additional Contributions: We extend our sincere thanks to the Danish Emergency Medical Services personnel who have completed the case report forms for the Danish Cardiac Arrest Registry, the Danish First Aid Council for sharing important information regarding widespread cardiopulmonary resuscitation training in Denmark, and the AED Network (http://www.hjertestarter.dk) for sharing information regarding the number of automated external defibrillators registered in the network.