Epidemiologic variables and outcome of 1972 young patients with acute myocardial infarction. Data from the GISSI-2 database. The GISSI investigators - Moccette, T; Malacrida, R; Pasotti, E; Sessa, F; Genoni, M; Barlera, S; Turazza, F; Maggioni, AP (Arch Intern Med, 1997)