Study concept and design: Curtis, Back, Shannon, Doorenbos, Kross, Engelberg.
Acquisition of data: Curtis, Back, Ford, Shannon, Doorenbos, Kross, Edlund, Arnold, O’Connor, Engelberg.
Analysis and interpretation of data: Curtis, Back, Ford, Downey, Shannon, Doorenbos, Reinke, Feemster, Arnold, Engelberg.
Drafting of the manuscript: Curtis, Back, Downey, Kross, Engelberg.
Critical revision of the manuscript for important intellectual content: Curtis, Back, Ford, Downey, Shannon, Doorenbos, Reinke, Feemster, Edlund, Arnold, O’Connor, Engelberg.
Statistical analysis: Downey.
Obtained funding: Curtis, Shannon, Engelberg.
Administrative, technical, or material support: Curtis, Back, Ford, Downey, Shannon, Doorenbos, Kross, Reinke, Edlund, O’Connor, Engelberg.
Study supervision: Back, Ford, Shannon, Engelberg.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Drs Feemster and Engelberg reported receiving salary support from a career development award from the National Heart, Lung, and Blood Institute. Dr Reinke reported receiving grants or grants pending from the Department of Veterans Affairs and the National Palliative Care Research Center and receiving payment for development of educational presentations from the European Respiratory Society. No other authors reported disclosures.
Funding/Support: This study was supported by the National Institute of Nursing Research of the National Institutes of Health (R01NR009987).
Role of the Sponsor: The National Institutes of Health had no role in the design and conduct of the study; the collection, management, analysis, and interpretation of the data; the preparation, review, or approval of the manuscript; or the decision to submit the manuscript for publication.
Disclaimer: The content of this article is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
Correction: This article was corrected online February 11, 2014, for incorrect language in Figure 1.