规范化甲型肝炎减毒活疫苗(LA-1株)大规模免疫后3年的抗体观察
규범화갑형간염감독활역묘(LA-1주)대규모면역후3년적항체관찰
A 3-year observation on antibody of large-scale immunization with a live attenuated hepatitis A vaccine (LA-1 strain)
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