Accepted for Publication: July 26, 2012.
Author Contributions: Drs Chang and Werth 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: Chang, Ghazi, and Werth. Acquisition of data: Chang, Ghazi, Okawa, and Werth. Analysis and interpretation of data: Chang and Werth. Drafting of the manuscript: Chang. Critical revision of the manuscript for important intellectual content: Chang, Ghazi, Okawa, and Werth. Statistical analysis: Chang and Werth. Obtained funding: Chang and Werth. Administrative, technical, and material support: Ghazi and Werth. Study supervision: Okawa and Werth.
Financial Disclosure: None reported.
Funding/Support: This study is based on work supported by the Doris Duke Charitable Foundation (Dr Chang) and the National Institutes of Health, grant NIH K24-AR 18 02207 (Dr Werth).