Postoperative portal vein thrombosis in patients with hepatosplenic mansonic schistosomiasis: relationship with intraoperative portal pressure and flow; a prospective study - Cleva, Roberto de; Herman, Paulo; Saad, William Abrãao; Pugliese, Vicenzo; Zilberstein, Bruno; Rodrigues, Joaquim Jose Gama; Laudanna, Antônio Atílio (Hepato-Gastroenterology, 2005)