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From the Division of Research, Kaiser Permanente Northern California; Department of Rheumatology, The Permanente Medical Group, Oakland, California; Patient Safety Department, AstraZeneca/MedImmune; Observational Research Center, AstraZeneca, Gaithersburg, Maryland, USA.L.J. Herrinton, PhD, Division of Research, Kaiser Permanente Northern California; L. Liu, MD, Division of Research, Kaiser Permanente Northern California; R. Goldfien, MD, Department of Rheumatology, The Permanente Medical Group; M.A. Michaels, MD, Patient Safety Department, AstraZeneca/MedImmune; T.N. Tran, MD, PhD, Observational Research Center, AstraZeneca.