1 Department of Oral & Maxillofacial Surgery, University of Tokyo Hospital, Tokyo 113-8655, Japan.
2 Division for Health Service Promotion, University of Tokyo, Tokyo 113-8655, Japan.
3 Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Center of Gastrointestinal Surgery, Peking University Cancer Hospital & Institute, Beijing 100142, China.
4 Graduate School of Medicine, University of Tokyo, Tokyo 113-0033, Japan.
5 Division of Epigenomics, National Cancer Center Research Institute, Tokyo 104-0045, Japan.