Teikyo University - Department of Surgery, Teikyo University - Department of Surgery, Osaka International Cancer Institute - Department of General Thoracic Surgery, The University of Osaka - Graduate School of Medicine, Kanagawa Cancer Center - Department of Thoracic Surgery, Jikei University - School of Medicine, Okayama University - Okayama University Hospital, Japanese Red Cross Kumamoto Hospital, National Cancer Center Hospital - Department of Thoracic Surgery, Keio University - School of Medicine, Dokkyo Medical University, Jichi Medical University, Showa University - School of Medicine, Nagoya City University - Graduate School of Medical Sciences, Tokyo University of Science, Chiba University Graduate School of Medicine - Department of General Thoracic Surgery, Chiba University Graduate School of Medicine - Department of General Thoracic Surgery and Kyoto University - Department of Thoracic Surgery