Affiliation: | 1. Department of Emergency Medicine, Seoul National University College of Medicine, 101 Daehakro, Chongno-Gu, Seoul, 110-744, Korea 2. Department of Biostatistics, Seoul National University Graduate School of Public Health, Seoul, Korea 3. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea 4. Department of Preventive Medicine, Inha University College of Medicine, Incheon, Korea
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