A typographical error was made in Equation 2.
The specific resistance was expressed as:
$$ {\hbox{R }} = {\hbox{ Q}}/\Delta {{\hbox{P}}^{{2}}} $$
The specific resistance should be expressed as:
$$ {\hbox{R }} = \Delta {{\hbox{P}}^{{0.{5}}}}/{\hbox{Q}} $$
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The online version of the original article can be found at http://dx.doi.org/10.1208/s12248-009-9121-4.
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Lee, S.L., Adams, W.P., Li, B.V. et al. Erratum to: In Vitro Considerations to Support Bioequivalence of Locally Acting Drugs in Dry Powder Inhalers for Lung Diseases. AAPS J 13, 141 (2011). https://doi.org/10.1208/s12248-010-9243-8
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DOI: https://doi.org/10.1208/s12248-010-9243-8