1. Department of Respiratory Medicine Juntendo University Graduate School of Medicine 2‐1‐1 Hongo Bunkyo‐ku Tokyo 113‐8421 Japan
2. Immuno‐Biological Laboratories Co., Ltd. 1091‐1 Naka Fujioka Gunma 375‐0005 Japan
3. Department of Pathology and Oncology Juntendo University Graduate School of Medicine 2‐1‐1 Hongo Bunkyo‐ku Tokyo 113‐8421 Japan