1993至2010年中国部分地区单胎初产妇剖宫产和孕妇要求剖宫产率变化趋势
1993지2010년중국부분지구단태초산부부궁산화잉부요구부궁산솔변화추세
Secular trends of cesarean delivery and cesarean delivery on maternal request among primiparous women with singleton pregnancy in Southern and Northern China during 1993-2010
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