In this article the EC95 for ritonavir was incorrectly stated to be 515 ng/mL. The correct EC95 is 1515 ng/mL.
In the Ritonavir subsection of the Results, the final sentence of the first paragraph should have read as follows (altered text is indicated in bold type):
All but one patient had detectable SP ritonavir concentrations at all time periods; however, all SP ritonavir concentrations were below the EC95 (1515 ng/mL) throughout the dosing interval.
In addition, the upper dashed line in Figure 1(b), representing the protein-corrected EC95 for ritonavir, was incorrectly positioned at 515 ng/mL. It should have been positioned at 1515 ng/mL. The corrected Figure 1(b)
is reproduced below.
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