Takahiro Mimae1, Hisashi Saji2, Morihito Okada1,3. 1. Department of Surgical Oncology, Hiroshima University, Hiroshima, Japan. 2. Department of Chest Surgery, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan. saji-q@ya2.so-net.ne.jp. 3. The Japanese Association for Chest Surgery, Committee for Scientific Affairs, Kyoto, Japan.