Accepted for Publication: August 25, 2011.
Author Contributions: Study concept and design: Shelburne and Trautner. Acquisition of data: Lin, Bhusal, Horwitz, and Trautner. Analysis and interpretation of data: Lin, Bhusal, Shelburne, and Trautner. Drafting of the manuscript: Lin, Bhusal, Horwitz, Shelburne, and Trautner. Critical revision of the manuscript for important intellectual content: Lin, Bhusal, Shelburne, and Trautner. Statistical analysis: Lin and Shelburne. Obtained funding: Trautner. Administrative, technical, and material support: Bhusal, Horwitz, Shelburne, and Trautner. Study supervision: Shelburne and Trautner.
Financial Disclosure: None reported.
Funding/Support: Dr Trautner's work was supported by a Veterans Affairs Career Development Award (B4623) and by Health Services Research & Development Service IIR 09-104. This work was supported in part by the Houston Veterans Affairs Health Services Research & Development Service Center of Excellence (HFP90-020).
Disclaimer: The views expressed are those of the authors and not necessarily those of the Department of Veterans Affairs/Baylor College of Medicine.
Additional Contributions: Nancy J. Petersen, PhD, provided statistical advice and assistance.