1. Department of Functional Genomics, Chiba University Graduate School of Medicine, Chiba 260-8670, Japan
2. Department of Otorhinolaryngology/Head and Neck Surgery, Chiba University Graduate School of Medicine, Chiba 260-8670, Japan
3. Department of Digestive Surgery, Breast and Thyroid Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima 890-8580, Japan