Clinico-pathological features of oropharyngeal squamous cell carcinomas in Malaysia with reference to HPV infection by Yap, Lee Fah, Lai, Sook Ling, Rhodes, Anthony, Sathasivam, Hans Prakash, Abdullah, Maizaton Atmadini, Pua, Kin Choo, Rajadurai, Pathmanathan, Cheah, Phaik Leng, Thavaraj, Selvam, Robinson, Max, Paterson, Ian Charles