Concurrent morning increase in platelet aggregability and the risk of myocardial infarction and sudden death - Tofler, G H; Brezinski, D; Schafer, A J; Czeisler, C A; Rutherford, J D; Willich, S N; Gleason, R E; Williams, G H; Muller, J E (N Engl J Med, 1987)