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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
第一年完美使用情况下女性怀孕的百分比
第一年典型使用情况下女性怀孕的百分比
安全期避孕法
5%
12%
宫颈黏液法
4%
14%
症状体温
< 1%
2%
