Department of Pediatrics, Samsung Medical Center, Seoul, South Korea
Department of Pediatrics, Seoul National University College of Medicine, Seoul, South Korea
Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, South Korea
Division of VPD Control and NIP, Korea Centers for Disease Control and Prevention, Chungchungbuk-do
Department of Public Health, Yonsei University Graduate School, Seoul, South Korea
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