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2 “...We assessed the extent of external validation and the variation in performance across data sets...”

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9 “... rehabilitation and early follow-up with physicians after hospital discharge and revealed important variations...”

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12 “..., complications of surgery are common and differ among the various surgical approaches. There is global variation...”

13 “... logit regression models to estimate racial/ethnic variation in treatment preferences and to understand...”

14 “...) Are variations in care associated with differences in patients' outcomes? (Aim 5) We created educational...”