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 General Internal Medicine and Clinical Laboratory Medicine, Akita University, Graduate School of Medicine, Akita, Japan.
4. Department of Dermatology, Keio University, School of Medicine, Tokyo, Japan.
5. Department of Otorhinolaryngology, Keio University, School of Medicine, Tokyo, Japan.
6. Division of Hematology, Department of Medicine, Keio University, School of Medicine, Tokyo, Japan.
7. Division of Infectious Diseases and Respiratory Medicine, Department of Internal Medicine, National Defense Medical College, Saitama, Japan.