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[\'Korea Centers for Disease Control and Prevention, Cheongju, Chungcheongbuk-do, The Republic of Korea.\', \'Department of Social and Preventive Medicine, Hallym University College of Medicine, Chuncheon, Gangwon, The Republic of Korea.\', \'Department of Paediatrics, Seoul National University Seoul Metropolitan Government Boramae Medical Center, Dongjak-gu, Seoul, The Republic of Korea.\', \'Department of Paediatrics, Catholic University of Korea College of Medicine, Seoul, The Republic of Korea.\', \'Department of Paediatrics, Seoul National University College of Medicine, Seoul, The Republic of Korea eunchoi@snu.ac.kr.\']
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