ROLE OF PAN MASALA AND TOBACCO RELATED PRODUCTS IN ORAL SUBMUCOSA FIBROSIS: A DENTAL OPD BASED OBSERVATIONAL STUDY AT TERTIARY CARE CENTER, IGIMS, PATNA, BIHAR Journal title: Journal of Indira Gandhi Institute of Medical Sciences Authors: Sanjay Kumar, Krishna Prasad Biswas, Rajesh Kumar Singh, Ahtasham Anwar, Vibha Rani Subject(s):