1. Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul 110-799, Korea.
2. Graduate School of Immunology, Seoul National University College of Medicine, Seoul 110-799, Korea.
3. Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul 110-799, Korea.
4. Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul 110-799, Korea.