Long-term follow-up of children with extrahepatic portal vein obstruction: impact of an endoscopic sclerotherapy program on bleeding episodes, hepatic function, hypersplenism, and mortality - Maksoud-Filho, João Gilberto; Gonçalves, Manuel Ernesto Peçanha; Cardoso, Silvia Regina; Gibelli, Nelson Elias Mendes; Tannuri, Uenis (Journal of pediatric surgery, 2009)