S Testa, G Morstabilini, A Fattorini, L Galli, N Denti, and A D’Angelo. 2002. “Discrepant Sensitivity of Thromboplastin Reagents to Clotting Factor Levels Explored by the Prothrombin Time in Patients on Stable Oral Anticoagulant Treatment: Impact on the International Normalized Ratio System”. Haematologica 87 (12). Pavia, Italy, 1265-73. https://doi.org/10.3324/%x.