How much do smoking and alcohol consumption explain socioeconomic inequalities in head and neck cancer risk? - Boing, Antonio Fernando; Antunes, José Leopoldo Ferreira; Carvalho, M. Brasilino de; Góis Filho, J. Francisco de; Kowalski, L. P; Michaluart Junior, Pedro; Eluf Neto, José; Boffetta, Paolo; Wünsch Filho, Victor; Okamoto, Oswaldo Keith (Journal of Epidemiology & Community Health, 2011)