Vitamin D concentration in maternal serum during pregnancy: Assessment in Hokkaido in adjunct study of the Japan Environment and Children's Study (JECS). by Ko Nakanishi, Mami Mutoh, Sachiko Itoh, Sumitaka Kobayashi, Takeshi Yamaguchi, Hiroyoshi Iwata, Naomi Tamura, Momoko Koishi, Machiko Kasai, Emi Kikuchi, Nanae Yasuura, Reiko Kishi, Yoshiaki Sato

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