1. Ferlay J, Bray F, Pisani P, Parkin DM. GLOBOCAN 2002: Cancer incidence, mortality and prevalence worldwide. IARC CancerBase No. 5, version 2.0. Lyon: IARCPress. Available from http://www-depdb.iarc.fr/globocan/GLOBOframe.htm.
2. Chiang Mai Cancer Registry. Annual report 1999. Faculty of Medicine, Chiang Mai University, Thailand.
3. British Dental Association. Occasional Paper No 6. Opportunistic oral cancer screening. London: BDA 2000.
4. Lip and Oral cavity. In: American Joint Committee on Cancer: AJCC Staging Manual. Philadelphia, PA: Lippincott—Raven Publishers; 1997, p. 24–30.
5. Squamous cell carcinoma of the oral cavity in patients aged 45 years and under: a descriptive analysis of 116 cases diagnosed in the South East of England from 1990 to 1997;Llevellyn;Oral Oncol,2003