Author Contributions: Dr Lin 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: Lin, Rabeneck.
Acquisition of data: Lin.
Analysis and interpretation of data: Lin, Kozarek, Schembre, Ayub, Gluck, Drennan, Soon, Rabeneck.
Drafting of the manuscript: Lin.
Critical revision of the manuscript for important intellectual content: Kozarek, Schembre, Ayub, Gluck, Drennan, Soon, Rabeneck.
Statistical analysis: Lin, Kozarek, Soon.
Study supervision: Kozarek, Schembre, Ayub, Rabeneck.
Financial Disclosures: None reported.
Acknowledgment: We thank John Brandabur, MD, James Bredfeldt, MD, David Patterson, MD, Susan McCormick, MD, Geoffrey Jiranek, MD, Nicoline Lomah, MSc, and William Spaulding, BA, all from the Virginia Mason Medical Center, for their assistance and input.