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Please see page 2 for the Editor's Capsule Summary of this article.
Supervising editor: John Sarko, MD
Author contributions: DGM, SRO, ASR, MER, UC, DRV, and DWB conceived the study and obtained research funding. DGM and Y-YH refined participant and variable selection. DGM and SRO undertook chart abstraction and managed the data, including quality control. Y-YH and MER provided statistical advice on study design and analyzed the data. DGM drafted the article, and all authors contributed substantially to its revision. DGM takes responsibility for the paper as a whole.
Funding and support: By Annals policy, all authors are required to disclose any and all commercial, financial, and other relationships in any way related to the subject of this article as per ICMJE conflict of interest guidelines (see www.icmje.org). The authors have stated that no such relationships exist. Funded by a Kaiser Permanente Northern California Community Benefits grant.
Publication date: Available online September 29, 2012.