Pre-and postoperative systemic hemodynamic evaluation in patients subjected to esophagogastric devascularization plus splenectomy and distal splenorenal shunt: a comparative study in schistomomal portal hypertension - Cleva, Roberto de; Herman, Pauloo; D'Albuquerque, Luis Augusto Carneiro; Pugliese, Vincenzo; Santarem, Orlando Luis; Saad, William Abraão (World Journal of Gastroenterology, 2007)