Improved survival among oral cancer patients: findings from a retrospective study at a tertiary care cancer centre in rural Kerala, India oleh Sajith Babu Thavarool, Geetha Muttath, Sangeetha Nayanar, Karthickeyan Duraisamy, Prasanth Bhat, Kalpita Shringarpure, Priyakanta Nayak, Jaya Prasad Tripathy, Alfonso Thaddeus, Sairu Philip, Satheesan B