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作者对2～6岁儿童接种5μg或10μg重组乙型肝炎疫苗（Engerix－B）进行一项随机多中心研究。
The authors conducted a randomized multicenter study of children aged 2 to 6 years who received 5 μg or 10 μg of recombinant hepatitis B vaccine (Engerix-B).