目的调查我国北方4市城区2～7岁儿童末梢全血锌原卟啉（ZPP）水平和铁缺乏症患病率。
Objective To investigate the levels of blood zinc protoporphyrin (ZPP) and prevalence of iron deficiency in 5333 children aged 2~7 in 4 cities of northern China.
目的调查我国北方4市城区2～7岁儿童末梢全血锌原卟啉（ZPP）水平和铁缺乏症患病率。
Objective To investigate the levels of blood zinc protoporphyrin (ZPP) and prevalence of iron deficiency in 5333 children aged 2~7 in 4 cities of northern China.
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