Experimental model of portal hypertension and esophagogastric varices in minipigs: pressure and endoscopic pilot study - Maluf-filho, Fauze; Meyer, Alberto; Martins, Pierre Pirchner Mathias; Galvao, Flavio Henrique Ferreira; D'albuquerque, Luiz Augusto Carneiro (Acta cirurgica brasileira, 2022)