Molecular alterations associated with chronic exposure to cigarette smoke and chewing tobacco in normal oral keratinocytes od Pavithra Rajagopalan, Ankit P. Jain, Krishna Patel, Vishalakshi Nanjappa, Kiran K. Mangalparthi, Anjali Kumari, Malini Manoharan, Coral Karunakaran, Saktivel Murugan, Bipin Nair, T.S. Keshava Prasad, Premendu P. Mathur, Ravi Gupta, Rohit Gupta, Arati Khanna-Gupta, David Sidransky, Harsha Gowda, Aditi Chatterjee