根据一期2009年的《艾滋病患者医疗与性传播疾病》中的研究文章，割礼所产生的预防效果来源于以下几个临床事实。
According to researchers writing in a 2009 issue of AIDS Patient Care and STDs, the prophylactic effect of male circumcision is owed to the following physical facts.
根据一期2009年的《艾滋病患者医疗与性传播疾病》中的研究文章，割礼所产生的预防效果来源于以下几个临床事实。
According to researchers writing in a 2009 issue of AIDS Patient Care and STDs, the prophylactic effect of male circumcision is owed to the following physical facts.
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