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patient anticoagulant anticoagulant therapy trial therapy infarction placebo group event treatment centre aspect value study prothrombin thrombosis chapter analysis range intensity control system number result table thrombosis centre mortality stroke interval anticoagulated group lesion death incidence quality measurement medication approach complication trial medication prothrombin time randomization agreement visit month anticoagulation effect reduction randomized thrombosis centres committee follow-up anticoagulated hospital observer prothrombin times ratio anticoagulant treatment patient-year factor method inr measurements post-myocardial infarction patients thromboembolic report phenprocoumon kappa anticoagulant group dosage computer heart level database information prevention aspirin ziekenhui antistolling technique inr values thromboembolic complications