Activation of sonic hedgehog signaling in oral squamous cell carcinomas: a preliminary study - Buim, Marcilei Eliza Cavicchioli; Gurgel, Clarissa Araújo S; Ramos, Eduardo Antônio Gonçalves; Lourenço, Sílvia Vanessa; Soares, Fernando Augusto (Human Pathology, 2011)