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The Preventative Services Task Force which provides advice for the officials of the  Department of Health agency of the U.S.said that the simple blood test called PSA may  do more harm than good.为美国卫生机构官员提供咨询的预防疾病服务工作组(The Preventative Services Task Force)说，对身体健康的男子而言，一种叫做PSA的简单验血可能弊大于利。