title: Substandard monitoring of warfarin in North America. Time for change.
authors.forename: J
authors.initials: J
authors.lastname: Hirsh
mesh_terms: D002170:Canada; D016903:Drug Monitoring; D006801:Humans; D011517:Prothrombin Time; D013925:Thromboplastin / Q000592:standards; D014481:United States; D014859:Warfarin / Q000627:therapeutic use*
chemical_list: D014859:Warfarin; D013925:Thromboplastin