1. Department of Thoracic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
2. Department of Thoracic Surgery, Kobe City Medical Center General Hospital, Kobe, Japan
3. Department of General Thoracic, Breast, and Pediatric Surgery, Faculty of Medicine, Fukuoka University, Fukuoka, Japan
4. Department of Thoracic Surgery, Osaka Red Cross Hospital, Osaka, Japan