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为了解杭州市缄区学龄前儿童血清维生素A(VitA)水平状况,我们于1996年8月对546名杭州市人幼儿园(托儿所)的健康儿童在进行健康体检的同时给予血清VitA含量测定,旨在尽早发现异
In order to understand the status of serum vitamin A level in pre-school children in Zhimian District of Hangzhou City, in August 1996, 546 healthy children from Hangzhou People’s Nursery School (nursery school) were given vitality test and serum VitA level Find differences as early as possible