Monitoring Mini-Intensity Anticoagulation with Warfarin - Comparison of the Prothrombin Time Using a Sensitive Thromboplastin with Prothrombin Fragment Fl+2 Levels - Millenson, M M; Bauer, K A; Kistler, J P; Bazegar, S; Fulin, L; Rosenberg, R D (Blood, 1992)