References
- Takahashi H, Okamoto M, Yao K, et al. Statistical analysis of cancer of the head and neck: Investigation of cancer in Kitasato University Hospital for 13 years. Head Neck Otolaryngol (Tokyo) 1989; 61: 1107–11 (in Japanese).
- Okamoto M, Takahashi H, Yao K, Inagi K, Nakayama M, Makoshi T. Clinical trend of head and neck malig-nancy: A statistical analysis of 26-year experience at the Kitasato University. Oto-Rhino-Laryngol Tokyo 1999; 42: 474–82 (in Japanese).
- Statistics and Information department, Minister's Secre-tariat. Vital statistics of Japan 1980–1993. Ministry of Wealth and Health, Tokyo.
- Yao K, Takahashi H, Okamoto M. Treatment of maxil-lary carcinoma: clinical results using Kitasato Method. Head Neck Cancer 1998; 24: 311–5(in Japanese).
- Hirayama T. Preventive oncology: New perspectives. Tokyo: Medical Science Inc., 1987 (in Japanese).
- Williams RR, Horm JW. Association of cancer sites with tobacco and alcohol consumption and socioeco-nomic status of patients: interview study from the third national cancer survey. J Natl Cancer Inst 1977; 58: 525 —47.