Smoking modulates interferon-y expression in the gingival tissue of patients with chronic periodontitis - César Neto, João B.; Duarte, Poliana M.; Oliveira, Maria Claudia G. de; Casati, Márcio Z.; Tambeli, Claudia H.; Parada, Carlos Amílcar; Sallum, Enilson A.; Nociti Jr., Francisco H. (European Journal of Oral Science, 2006)