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Comparison of mean MPH concentration (conc) time curves of single evening doses of DR/ER-MPH (20 and 100 mg) and single morning doses of OROS MPH (18, 36, and 54 mg), MPH CD (20, 40, and 60 mg), d-MPH ER (20 mg), and MEROS (60 mg). Evening-dosed DR/ER-MPH is assumed to be administered 10 hours before morning administration.
