期刊
INTERNATIONAL JOURNAL OF GYNECOLOGY & OBSTETRICS
卷 116, 期 1, 页码 76-77出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.ijgo.2011.09.010
关键词
25-hydroxyvitamin D; Nutritional intake; Pregnancy; Prenatal care; Vitamin D; Sun exposure; Traditional clothing
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