中国计划生育学杂志
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孕妇维生素A水平影响因素调查
1.西安医学院附属北方医院;2. 陕西省人民医院
The Investigation of influencing factors of vitamin A levels of pregnant women
1.North Hospital Affiliated to Xi 'an Medical College of Xi’an, Shaanxi province, 710043;2. Shaanxi Provincial People's Hospital