1. Division of Infectious Diseases, Department of Internal Medicine; Gachon University Gil Medical Center; Incheon Korea
2. Department of Otorhinolaryngology-Head and Neck Surgery; Nowon Eulji Medical Center, Eulji University; Seoul Korea
3. Department of Radiology; Nowon Eulji Medical Center, Eulji University; Seoul Korea
4. Department of Pathology; Daejeon Eulji Medical Center, Eulji University; Daejon Korea
5. Department of Pathology; Nowon Eulji Medical Center, Eulji University; Seoul Korea