Antithrombotic therapy with fondaparinux in relation to interventional management strategy in patients with ST and non-ST-segment elevation acute coronary syndromes: an individual patient-level combined analysis of the Fifth and Sixth Organization to Assess Strategies in Ischemic Syndromes (OASIS 5 and 6) randomized trials - Mehta, SR; Boden, WE; Eikelboom, JW (Circulation, 2008)