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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 ]
肠绞窄(对肠道的供血阻断)通常由以下三种情况之一引起: 绞窄疝 、 肠扭转 或 肠套叠 。