1. Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine, Chiba University, Chiba, Chiba, Japan
2. Minimally Invasive Surgery Center, Yotsuya Medical Cube, Tokyo, Japan
3. Department of Gastroenterology, Graduate School of Medicine, Chiba University, Chiba, Chiba, Japan
4. Department of Medical Oncology, Graduate School of Medicine, Chiba University, Chiba, Chiba, Japan
5. Chiba Rosai Hospital, Ichihara, Chiba, Japan
6. Suzuki ENT Clinic, Narashino, Chiba, Japan
7. Esophageal Institute, Allegheny Health Network, Pittsburgh, PA, USA