Study concept and design: Lam, Corley.
Acquisition of data: Lam, Corley.
Analysis and interpretation of data: Lam, Schneider, Zhao, Corley.
Drafting of the manuscript: Lam, Schneider, Zhao, Corley.
Critical revision of the manuscript for important intellectual content: Schneider, Corley.
Statistical analysis: Lam, Zhao, Corley.
Obtained funding: Corley.
Administrative, technical, or material support: Schneider, Corley.
Study supervision: Schneider, Corley.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Corley reported receiving a grant or grant pending from Wyeth/Pfizer. No other authors reported disclosures.
Funding/Support: This project was supported by a Kaiser Permanente Community Benefit grant.
Role of the Sponsor: Kaiser Permanente 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.