Methods The study was strictly designed with randomization, double blinding, and placebo controlled method to observe the efficacy and immune memory 11 years following hepatitis B vaccination.
方法按随机、双盲、安慰剂对照严格设计，对乙型肝炎疫苗接种11年后效果及免疫记忆进行观察。
Randomized, there are placebo-controlled, double-blind, multi-center clinical trials to prove efficacy is a reliable method.
随机分组、有安慰剂对照、双盲、多中心的临床试验，才是证明疗效的可靠方法。
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