Low level of immunity against hepatitis A among Korean adolescents: Vaccination rate and related factors by Heo, Jung Yeon, MD, Song, Joon Young, MD, Noh, Ji Yun, MD, Seo, Yu Bin, MD, Kim, In Sun, MD, Choi, Won Suk, MD, Kim, Woo Joo, MD, PhD, Cho, Gum Joo, MD, Hwang, Taik Gun, MD, Cheong, Hee Jin, MD, PhD

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