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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 ]
医生通过阴道将宫内节育器 (IUD) 插入到女性子宫中。宫内节育器由模制塑料制成。两种类型的宫内节育器会释放称为左炔诺孕酮的孕激素。另一类是 T 形,其 T 形底部和臂上缠绕铜丝。宫内节育器系有一根塑料线。该塑料线可让女性确保设备仍然处于原位,并有助于医生轻松将其取出。