1. Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea.
2. Laboratory of Mucosal Immunology in Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea.
3. Department of Internal Medicine, Seoul National University College of Medicine, Seoul 03080, Korea.
4. Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul 03080, Korea.