1. Division of Dentistry and Oral Surgery, Shizuoka Cancer Center Hospital, Shizuoka, Japan
2. Department of Dentistry and Oral Surgery, School of Medicine, Keio University, Tokyo, Japan
3. Division of Esophageal Surgery, Shizuoka Cancer Center Hospital, Shizuoka, Japan
4. Clinical Trial Coordination Office, Shizuoka Cancer Center Hospital, Shizuoka, Japan
5. Department of Surgery, School of Medicine, Keio University, Tokyo, Japan