Blood samples (2 mL) were collected from subjects who provided informed consent for genetic polymorphism analysis of CYP2C19 once before Week 8 (Visit 5) of the treatment period after randomization. Genetic analysis was performed by an independent laboratory (SRL Mediserch Inc., Tokyo, Japan). The frequency of genetic polymorphisms of CYP2C19 was calculated by treatment group. Patients were classified as extensive metabolizers, intermediate metabolizers, or poor metabolizers.
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