Accepted for Publication: November 23, 2011.
Author Contributions: Drs Vasquez and Chong had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Vasquez and Chong. Acquisition of data: Vasquez, Tseng, Victor, and Chong. Analysis and interpretation of data: Vasquez, Zhang, and Chong. Drafting of the manuscript: Vasquez and Chong. Critical revision of the manuscript for important intellectual content: Vasquez, Tseng, Victor, Zhang, and Chong. Statistical analysis: Vasquez and Zhang. Obtained funding: Chong. Administrative, technical, and material support: Vasquez, Tseng, and Victor. Study supervision: Chong.
Financial Disclosure: Dr Chong is an investigator for Celgene Corporation and Amgen Incorporated.
Funding/Support: This project was funded in part by National Institutes of Health Clinical and Translational Science Award grant UL1 RR024982 and the American College of Rheumatology/Arthritis Foundation Bridge Funding Grant (Dr Chong).
Role of the Sponsors: The sponsors had no role in the design and conduct of the study; in the collection, analysis, and interpretation of data; or in the preparation, review, or approval of the manuscript.