登陆My NCBI（没有的话请注册）点击Manage Filters点击Create custom filter在弹出的Query terms的对话框中输入包含所有影响因子大于30、20等的检索式Save filter as 中输入名称，如“IF30”，点击Save Filter最新的影响因子检索式如下：直接复制进去进行IF30“CA-A CANCER JOURNAL FOR CLINICIANS”Journal or “NEW ENGLAND JOURNAL OF MEDICINE”Journal or “CHEMICAL REVIEWS”Journal or “REVIEWS OF MODERN PHYSICS”Journal or “NATURE”Journal or “Annual Review of Immunology”Journal or “NATURE REVIEWS GENETICS”Journal or “LANCET”Journal or “NATURE BIOTE
