中国计划生育学杂志
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二孩政策实施后备孕妇女身体质量指数的流行趋势分析
1. 兰州大学公共卫生学院(730000);2. 国家卫生健康委科学技术研究所
Trend analysis of body mass index value of women during the preparing pregnancy after the implementation of the two-child policy
1. School of Public Health, Lanzhou University, Lanzhou, Gansu Province, 730000; 2. National Research Institute for Family Planning, Beijing