1. Department of Respiratory Medicine, International Medical Center of Japan, Shinjuku-Ku, Tokyo, Japan
2. Department of Surgery, International Medical Center of Japan, Shinjuku-Ku, Tokyo, Japan
3. Pathology Division of the Clinical Laboratory Department, International Medical Center of Japan, Shinjuku-Ku, Tokyo, Japan
4. Department of Pathology II, National Defense Medical College, Tokorozawa, Saitama, Japan
5. Department of Thoracic Surgery, International Medical Center of Japan, Shinjuku-Ku, Tokyo, Japan
6. Disease Control and Prevention Center, International Medical Center of Japan, Shinjuku-Ku, Tokyo, Japan