Chemopreventive effects of Paullinia cupana Mart var. sorbilis, the guaraná, on mouse hepatocarcinogenesis - Fukumasu, Heidge; Silva, Tereza Cristina da; Avanzo, José Luis; Lima, Cyntia Esteves de; Mackowiak, Ivone Isabel; Atroch, André; Spinosa, Helenice de Souza; Moreno, Fernando Salvador; Dagli, Maria Lúcia Zaidan (Cancer Letters, 2006)