Endoscopic prophylaxis and factors associated with bleeding in children with extrahepatic portal vein obstruction Ana Paula Pereira de Oliveira; Alexandre Rodrigues Ferreira; Eleonora Druve Tavares Fagundes; Thaís Costa Nascentes Queiroz; Simone Diniz Carvalho; José Andrade Franco Neto; Paulo Fernando Souto Bittencourt;