1. Department of Esophageal Surgery Gastroenterology Center Cancer Institute Hospital of Japanese Foundation for Cancer Research Tokyo Japan
2. Department of Otolaryngology Graduate School of Medicine Nagoya University Nagoya Japan
3. Department of Gastrointestinal and Pediatric Surgery Tokyo Medical University Tokyo Japan
4. Department of Surgery Faculty of Medicine Kindai University Osaka Japan
5. Department of Head and Neck Surgery Cancer Institute Hospital of Japanese Foundation for Cancer Research Tokyo Japan
6. Department of Gastroenterological Surgery Graduate School of Medical Sciences Kumamoto University Kumamoto Japan
7. Department of Head and Neck Surgery Hyogo Cancer Center Hyogo Japan
8. Department of Otolaryngology‐Head and Neck Surgery Kobe University Graduate School of Medicine Hyogo Japan
9. Department of Digestive Surgery Osaka International Cancer Institute Osaka Japan
10. Department of Gastroenterological Surgery National Hospital Organization Kyushu Cancer Center Fukuoka Japan
11. Department of General Surgical Science Gunma University Graduate School of Medicine Gunma Japan
12. Department of Gastroenterological Surgery Saitama Medical University International Medical Center Saitama Japan
13. Department of Gastroenterological and Pediatric Surgery Oita University Faculty of Medicine Oita Japan
14. Department of Esophageal and Gastroenterological Surgery Juntendo University School of Medicine Tokyo Japan
15. Department of Otolaryngology‐Head and Neck Surgery Kochi University Kochi Japan
16. The Japan Broncho‐Esophagological Society Japan
17. Department of Otolaryngology‐Head and Neck Surgery National Defense Medical College Saitama Japan