Author Contributions: Dr Pasternak 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: Pasternak, Svanström, Mølgaard-Nielsen, Hviid.
Acquisition of data: Svanström, Krause, Emborg, Hviid.
Analysis and interpretation of data: Pasternak, Svanström, Mølgaard-Nielsen, Krause, Emborg, Melbye, Hviid.
Drafting of the manuscript: Pasternak.
Critical revision of the manuscript for important intellectual content: Svanström, Mølgaard-Nielsen, Krause, Emborg, Melbye, Hviid.
Statistical analysis: Svanström.
Obtained funding: Pasternak.
Study supervision: Krause, Melbye, Hviid.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This work was funded by the Danish Medical Research Council (grant 11-115854 to Dr Pasternak).
Role of the Sponsor: The funding agency had no role in the design and conduct of the study; in the collection, analysis, management, and interpretation of the data; or in the preparation, review, and approval of the manuscript.
Online-Only Material: The Author Video Interview is available .