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[\'National Emergency Medical Center, National Medical Center, Seoul, Korea.\', \'Department of Emergency Medicine, Yonsei University College of Medicine, Seoul, Korea.\', \'Department of Emergency Medicine, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea.\', \'Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea.\', \'Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea. jichoon81@yuhs.ac.kr.\']
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