Documents Savoirs Socio-demographic correlates of betel, areca and smokeless tobacco use as a high risk behavior for head and neck cancers in a squatter settlement of Karachi, Pakistan Mazahir Samia, Maqsood Maria, Malik Farida, Fatmi Zafar, Ghaffar, Malik Rabia, Merchant Kanwal, Majeed Atif, Khawaja Muhammad, Ghaffar Shehzad