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Distribution of the ratio between the [I]/Ki factor of RTV (considering the highest RTV Ki) and that of the other PIs among the patients. The dashed line marks the cutoff of 1, indicating a higher activity of RTV than that of the concomitant PI. DRV800, DRV-RTV 800 and 100 mg once daily; DRV600, DRV-RTV 600 and 100 mg twice daily. Circles and asterisks indicate mild and extreme outliers, respectively.
