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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 ]
家族成员有骨质疏松症
饮食中钙和维生素 D 摄入不足
运动少
体格较瘦
过早绝经
吸烟
酗酒
