METHODS: The parallel double blind randomized control clinical trial was used.

方法：采用平行双盲随机对照研究。

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METHODS: Cortex fraxini total coumarin was involved in a randomized, double-blind, placebo parallel control, dosage-reaction design and superiority test.

方法：采用随机、双盲、安慰剂平行组对照、剂量反应研究设计和优效性检验。

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METHODS: Randomized double blind control clinical trial was used.

方法：随机双盲双模拟对照研究。

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In the double-blind, randomized control trial, half the women got tenofovir gel and half got a placebo.

CNN: Gel cuts HIV transmission rate in study