Aspirin, sulfinpyrazone, or both in unstable angina. Results of a Canadian multicenter trial - Cairns, JA; Gent, M; Singer, J; Finnie, KJ; Frogatt, GM; Holder, DA; Jablonsky, G; Kostuk, WJ; Melendez, LJ; Myers, MG; Sackett, DL; Sealey, BJ; Tanser, PH (N Engl J Med, 1985)