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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 ]
正常情况下，卵子在输卵管受精并在子宫着床。但是，如果输卵管狭窄或阻塞，卵子可能会移动缓慢或被卡住。受精卵可能永远不会到达子宫，导致异位妊娠。
异位妊娠可能着床于许多部位，比如输卵管、卵巢、宫颈或腹腔。
