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• Use “ “ for phrases o [ “pediatric abdominal pain” ] • Use – to remove results with certain terms o [ “abdominal pain” –pediatric ] • Use OR to account for alternate terms o [teenager OR adolescent ]
措施
因紧急避孕失败而怀孕的女性百分比
铜释放宫内节育器
0.1%
释放左炔诺孕酮的宫内节育器（高剂量）
0.3%
口服左炔诺孕酮
2–3%
醋酸乌利司他（单剂量）
1.5%
IUD = 宫内节育器。
