早产儿出生时维生素D水平及影响因素分析
Vitamin D level at birth and influencing factors in preterm infants

DOI: 10.7499/j.issn.1008-8830.2017.07.014

Keywords: 25-羟基维生素D,维生素D缺乏,早产儿,
25-Hydroxyvitamin D,Vitamin D defciency,Preterm infant

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