1. Division of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan.
2. Keio Allergy Center, Keio University Hospital, Tokyo, Japan.
3. Department of Respiratory Medicine, National Hospital Organization Tokyo Medical Center, Tokyo, Japan.
4. Division of Infectious Diseases and Respiratory Medicine, Department of Internal Medicine, National Defense Medical College, Saitama, Japan.
5. Department of Dermatology, Keio University School of Medicine, Tokyo, Japan.