1. Estimates of worldwide burden of cancer in 2008: GLOBOCAN 2008;Ferlay;Int J Cancer,2010
2. Global cancer statistics, 2002;Parkin;CA Cancer J Clin,2005
3. Oral cancer prevention and control-the approach of the World Health Organization;Petersen;Oral Oncol,2009
4. Relationship between chronic trauma of the oral mucosa, oral potentially malignant disorders and oral cancer;Piemonte;J Oral Pathol Med,2010
5. Causes of oral cancer-an appraisal of controversies;Warnakulasuriya;Br Dent J,2009