1. Department of Thoracic Surgery, National Cancer Center Hospital East, Kashiwa, Chiba, Japan
2. Department of Diabetes Oncology, National Cancer Center Hospital East, Kashiwa, Chiba, Japan
3. Biostatistics Division, Center for Research Administration and Support, National Cancer Center Hospital, Tokyo, Japan
4. Department of General Thoracic Surgery, Juntendo University School of Medicine, Tokyo, Japan