Sanofi-aventis (EURONEXT: SAN and NYSE: SNY) and Bristol-Myers Squibb Company (NYSE: BMY) announced today new findings from a landmark investigational study that demonstrated that, for patients with atrial fibrillation who were at increased risk for stroke and could not take an oral anticoagulant (OAC) medication, taking Plavix® (clopidogrel bisulfate) in addition to aspirin significantly reduced major vascular events by 11% over aspirin alone, at a median of 3.6 years of follow-up (6.