Van Der Woude syndrome/popliteal pterigium syndrome: clinical and genetic variability in brazilian patients with IRF6 gene mutations - Zechi-Ceide, Roseli Maria; Guion-Almeida, Maria Leine; Oliveira, N. A. J; Richieri-Costa, Antonio; Passos-Bueno, Maria Rita (International Congress on Cleft Lip and Palate and Related Craniofacial Anomalies: Cleft and craniofacial care experience, evolution and innovation, 2009)