1. Harrison LB, Sessions RB, Hong WK. Head and neck cancer: a multidisciplinary approach. Philadelphia: Lippincott Williams & Wilkins; 2009. p. 24.
2. van Hulst AM, Kroon W, van der Linden ES, Nagtzaam L, Ottenhof SR, Wegner I, et al. Grade of dysplasia and malignant transformation in adults with premalignant laryngeal lesions. Head Neck. 2016;38(S1):E2284–90.
3. Reibel J. Prognosis of oral pre-malignant lesions: significance of clinical, histopathological, and molecular biological characteristics. Crit Rev Oral Biol Med. 2003;14(1):47–62.
4. Cowan C, Gregg T, Napier S, McKenna S, Kee F. Potentially malignant oral lesions in Northern Ireland: a 20-year population-based perspective of malignant transformation. Oral Dis. 2001;7(1):18–24.
5. Sadiq H, Gupta P, Singh N, Thakar S, Prabhakar I, Thakral J. Various grading systems of the oral epithelial dysplasia: a review. Int J Adv Health Sci. 2015;1:20–6.