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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 ]
食管闭锁时，食管变窄或形成一个盲端。它不像平常那样与胃相连。气管食管瘘是食管和气管（进入肺内）之间存在的异常通路。
