Comparison of two treatment durations (6 days and 14 days) of a low-molecular-weight heparin with a 6-day treatment of unfractionated heparin in the initial management of unstable angina or non Q wave myocardial infarction: FRAxis (fraxiparine in ischaemic syndrome) - Leizerovic A and the FRAxis study group. (Eur Heart, 1999)