Dilution curve studies in prothrombin complex factors deficiencies and abnormalities. Blut 3 Girolami A, Brunetti A, Patrassi G M. Normotest-Thrombotest discrepancy in congenital coagulation disorders of the prothrombin complex and in coumarin treated patients. A non-specific phenomenon - Girolami, A; Brunetti, A; De Marco, L; Fioretti, D (Am. J. Clin. Path., 1977)