Affiliation: | 1. Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, 86 Asanbyeongwon-gil, Songpa-gu, Seoul, 138-736, Korea 2. Department of Hospitalist Medicine, University of Chicago Medical Center, University of Chicago, Chicago, IL, USA 3. Department of Otolaryngology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea 4. Department of Pulmonary Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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