孙玲玲, 蒲杰, 王艳丽, 何丹郑, 姝娟, 杜晓红… - 中国妇幼卫生 …, 2019 - zgfyws.chinawch.cn
… deficiency should be strengthened and active intervention … nutritional status of vitamin D
and guide its effective and reasonable supplement,so as to provide a basis for follow-up nutrition …