Effect of melatonin on the severity of L-arginine-induced experimental acute pancreatitis in rats - Szabolcs, A ; Hegyi, P ; Pápai, G ; Varga, I ; Kaszaki, J ; Letoha, T ; Sári, R ; Lonovics, J ; Reiter, R (Zeitschrift für Gastroenterologie, 2004)