Is there a therapeutic window for pentoxifylline after the onset of acute pancreatitis? - Coelho, Ana Maria Mendonça; Kunitake, Tiago Alexandre; Machado, Marcel Cerqueira Cesar; Martins, Joilson de Oliveira; Patzina, Rosely Antunes; D'Albuquerque, Luiz Augusto Carneiro; Jukemura, José (Acta cirúrgica brasileira, 2012)