Paediatrics and Child Health ACSA-CAAH Use of Emergency Contraception Among Women Aged 15-44, United States, 2006-2010 NationalCenterforHealthStatistics
国家教育统计中心(英语:National Center for Education Statistics)(NCES) 全国卫生统计中心(英语:NationalCenterforHealthStatistics)(NCHS) 国家科学基金会(NSF) 社会保障局(英语:Social Security Administration)(SSA)