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usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual 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metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage metformin usual dosage.