Objective To investigate and compare the effect and safety of levocetirizine and cetirizine for the treatment of chronic idiopathetic urticaria (CIU).
目的：评价左西替利嗪治疗常年性过敏性鼻炎的有效性和安全性。
Objective To investigate and compare the effect and safety of levocetirizine and cetirizine for the treatment of chronic idiopathetic urticaria (CIU).
目的：评价左西替利嗪治疗常年性过敏性鼻炎的有效性和安全性。
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