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Comparison of HFA 227 formulations in terms of drug deposited in USP throat of NGI maintaining constant concentration of fluorescein Na and Pluronic L81 (data represent mean ± SD, n = 3). *P < 0.05 (ANOVA/Tukey's) 15% w/w EtOH versus 10 & 5% w/w EtOH, **P < 0.05 (ANOVA/Tukey's) 13% w/w EtOH versus 5% w/w EtOH.
