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OARS
Optimal Atherectomy Restenosis Study
OASIS
Organization to Assess Strategies for Ischemic Syndromes
OCBAS
Optimal Coronary Balloon Angioplasty versus Stent
OMERACT
Outcome Measures in Rheumatology Clinical Trial
ONTT
Optic Neuritis Treatment Trial
OPERA
Omapatrilat in Persons with Enhanced Risk of Atherosclerotic Events
OPTIMA
Oxford Project to Investigate Memory and Aging
OPTIMAAL
Optimal Trial in Myocardial Infarction with the Angiotensin II Antagonist Losartan
OPTIMAAL
Optimal Therapy in Myocardial Infarction with the Angiotensin II Antagonist Losartan
OPTIME-CHF
Outcomes of a Prospective Trial of Intravenous Milrinone for Exacerbations of Chronic Heart Failure
OPUS
Orbofiban in Patients with Unstable Coronary Syndromes
ORBIT
Oral Glycoprotein IIb/IIIa Receptor Blockade to Inhibit Thrombosis
ORCHID
Optimal Regimen Cures Helicobacter-Induced Dyspepsia
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