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[\'Department of Pediatrics, Korea University Anam Hospital, Seoul, Republic of Korea.\', \'Director for Epidemiological Investigation Analysis, Korea Disease Control and Prevention Agency, Cheongju, Chungcheongbuk-do, Republic of Korea.\', \'Student Health Policy Division, Ministry of Education, Jongno-gu, Seoul, Republic of Korea.\', \'Department of Pediatrics, Chungnam National University Hospital, Daejeon, Daejeon, Republic of Korea.\', \'Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.\', \'Department of Pediatrics, Korea University Ansan Hospital, Ansan, Gyeonggi-do, Republic of Korea.\', \'Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Gangnam-gu, Seoul, Republic of Korea.\', \'Department of Pediatrics, Seoul National University Hospital, Jongno-gu, Seoul, Republic of Korea eunchoi@snu.ac.kr.\']
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