1. Department of Otolaryngology–Head & Neck Surgery Graduate School of Medicine, Kyoto UniversityKyoto Japan
2. Department of Gastroenterology and Hepatology Graduate School of Medicine, Kyoto UniversityKyoto Japan
3. Department of Clinical oncology Graduate School of Medicine, Kyoto UniversityKyoto Japan
4. King ChulalongKorn Memorial HospitalThailand
5. Department of Biomedical Statistics and BioinformaticsGraduate School of Medicine, Kyoto UniversityKyoto Japan