Study concept and design: Malta Hansen, Kragholm, Dupre, Granger.
Acquisition, analysis, or interpretation of data: Malta Hansen, Kragholm, Tyson, Monk, Dupre, Fosbøl, Jollis, Strauss, Anderson, McNally, Granger.
Drafting of the manuscript: Malta Hansen, Kragholm, Granger.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Malta Hansen, Dupre, Strauss.
Obtained funding: Jollis, Granger.
Administrative, technical, or material support: Tyson, Monk, Nelson, Pearson, Myers, Fosbøl, Jollis, Anderson, McNally, Granger.
Study supervision: Malta Hansen, Kragholm, Pearson, Jollis, Granger.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Malta Hansen reported receiving grants from Laerdal, TrygFonden, and Helsefonden. Dr Kragholm reported receiving grants from Laerdal and the Danish Heart Association. Drs Granger and Jollis reported receiving grants from The Medtronic Foundation. No other disclosures were reported.
Funding/Support: This study was supported by the HeartRescue Project, which is funded by the Medtronic Foundation.
Role of Funder/Sponsor: The study sponsor 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 emergency medical services and hospital personnel who have completed the case report forms for the CARES registry.