沧州市早产儿血清维生素D水平及其母亲认知情况调查分析
张丽萍,闫瑞霞,孙玉敏,任建立,于彩霞
Investigation on serum vitamin D levels in preterm infants and their mothers knowledge of vitamin D
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中国儿童保健杂志 . 2013, (8): 870 -872 .