1. Department of Otolaryngology - Head and Neck Surgery, Graduate School of Medicine; Kyoto University; Kyoto Japan
2. Department of Otorhinolaryngology; Yonsei University College of Medicine; Seoul Republic of Korea
3. Division of Otorhinolaryngology - Head and Neck Surgery, Department of Surgery; University of Hong Kong; Hong Kong
4. Division of Head and Neck Surgery, Department of Otolaryngology; Stanford University; Palo Alto California
5. Department of Biomedical Statistics and Bioinformatics; Graduate School of Medicine, Kyoto University; Kyoto Japan
6. Department of Otolaryngology; Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital; Tokyo Japan