The patients were split into three groups: young (ages 20 to 40), middle-aged (41 to 64) and older (65 and up).
这些病患被分为三组：年轻组（20到40岁）、中年组（41到64岁）以及老年组（大于等于65岁）。
The patients were split into three groups: young (ages 20 to 40), middle-aged (41 to 64) and older (65 and up).
这些病患被分为三组：年轻组（20到40岁）、中年组（41到64岁）以及老年组（大于等于65岁）。
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