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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 ]
妇女在 30 岁前，骨密度随年龄逐渐增高，30 岁时骨骼最为强壮。30 岁后骨密度逐渐降低。绝经期后骨密度下降更快，平均年龄 51 岁左右出现。
