van den Besselaar, A M Monitoring oral anticoagulant therapy by the prothrombin time: reporting the coagulation activity or the international normalized ratio? [electronic resource] - Haemostasis - 1-3 p. digital Publication Type: Comment; Editorial ISSN: 0301-0147 Standard No.: 10.1159/000217073 doi Subjects--Topical Terms: Administration, OralAnticoagulants--administration & dosageCalibrationHumansProthrombin TimeReference Standards