ACC/AHA guidelines for the management of patients with unstable angina and non-ST-segment elevation myocardial infarction: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Committee on the Management of Patients with Unstable Angina). - Braunwald,E.; Antman,E.M.; Beasley,J.W. (J Am Coll Cardiol, 2000)