Selectivity of oral aspirin as an inhibitor of platelet vs. vascular cyclooxygenase activity is reduced by portacaval shunt in rats - Gambino, M C; Passaghe, S; Chen, Z M; Bucchi, F; Gori, G; Latini, R; DeGaetano, G; Cerletti, C (J Pharmacol Exp Ther, 1988)