Potential failure on the International Normalized Ratio (INR) system in the monitoring of oral anticoagulation in patients with lupus anticoagulants. - Della Valle, P; Crippa, L; Safa, O; Tomassini, L; Pattarini, E; Vigano’-D’Angelo, S; Sabbadini, MG; D’Angelo, A (Ann Med Interne, 1996)