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Stage by stage deposition of tiotropium bromide monohydrate following aerosolization of Spiriva capsules from the HandiHaler, the Cyclohaler, mod 1, and mod 2 into the NGI at a 20, b 39, and c 55 l/min. MP and T represent mouthpiece and throat, while PS represents pre-separator. Error bars in graphical representations of data represent ±1 standard deviation
