Result: the DDDs of the first generation antihistamine drugs was trending to decline, but that of the second was trending to increase constantly.
结果：第一代抗组胺药的用药频度呈下降趋势，第二代稳步上升。
Result: the DDDs of the first generation antihistamine drugs was trending to decline, but that of the second was trending to increase constantly.
结果：第一代抗组胺药的用药频度呈下降趋势，第二代稳步上升。
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