中国计划生育学杂志
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我国计划妊娠女性妊娠间隔及其影响因素的横断面研究
1.兰州大学公共卫生学院流行病与卫生统计学研究所(730000);2.国家卫生健康委科学技术研究所
A cross-sectional study of the interpregnancy intervals and its influence factors of women with planned pregnancies in China
1.Institute of Epidemiology and Statistics, School of Public Health, Lanzhou University, Lanzhou, Gansu Province, 730000; 2.National Research Institute for Family Planning, Beijing