Author Contributions: Dr Alehagen 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: Alehagen, Dahlström, Goetze.
Acquisition of data: Alehagen, Goetze.
Analysis and interpretation of data: Alehagen, Dahlström, Rehfeld, Goetze.
Drafting of the manuscript: Alehagen, Goetze.
Critical revision of the manuscript for important intellectual content: Alehagen, Dahlström, Rehfeld, Goetze.
Statistical analysis: Alehagen, Goetze.
Obtained funding: Alehagen, Goetze.
Administrative, technical, or material support: Alehagen, Rehfeld, Goetze.
Study supervision: Alehagen, Dahlström, Goetze.
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 study was supported by grants from the County Council of Östergötland, the Swedish Heart and Lung Foundation, and the University of Linköping.
Role of the Sponsor: The funding organizations had no role in the design and concept of the study; the collection, management, analysis, and interpretation of the data; or the preparation, review, or approval of the manuscript.
Additional Contributions: We thank laboratory technical assistants Lone Olsen and Signe Poulsen (Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark) for their expertise with the copeptin measurements. These individuals received no extra compensation for their contributions.