1.unstable angina pectoris 2.clinically-significant cardiac arrhythmias 3.stroke (including Transient Ischemic Attack (TIA), or other ischemic event) 4.myocardial infarction (MI) 5.thromboembolic event requiring therapeutic anticoagulation (Note: subjects with a venous filter (e.g. vena cava filter) are not eligible for this study)