Objective: to study relation between children with recurrent respiratory trace infection and zine, selenium in serum.
目的：了解反复呼吸道感染与血清中微量元素锌、硒含量的关系。
Objective: to investigate the content of trace element in hair and the condition of immune function in patients with recurrent respiratory infection (RRI).
目的：探讨反复性呼吸道感染患儿头发中微量元素含量及机体免疫功能状态。
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