方法采用随机双盲、安慰剂平行对照研究。
Methods A random, double blind, and placebo control study was conducted.
方法：采用随机、双盲、安慰剂平行对照研究。
Methods: A randomized and double-blind controlled clinical trial was conducted for smoking cessation.
方法：采用区组随机、双盲、安慰剂平行对照临床试验。
Method: This clinical research adopts randomized blocks, double-blind and placebo control.
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。
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。
METHODS: Cortex fraxini total coumarin was involved in a randomized, double-blind, placebo parallel control, dosage-reaction design and superiority test.
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