1. Department of Respiratory Medicine Gifu Prefectural Tajimi Hospital 5‐161, Maehata‐cho Tajimi Gifu 507‐8522 Japan
2. Department of Thoracic Surgery Gifu Prefectural Tajimi Hospital 5‐161, Maehata‐cho Tajimi Gifu 507‐8522 Japan
3. Department of Pathology Gifu Prefectural Tajimi Hospital 5‐161, Maehata‐cho Tajimi Gifu 507‐8522 Japan