in a previous paper , we showed that the abnormality of ristocetin-induced platelet aggregation in platelet-rich plasma in 10 patients with von willebrand 's disease could be corrected by a factor in normal plasma that was present in the same fractions as factor viii procoagulant activity ( antihemophilic factor , ahf , viii ( ahf ) ) when prepared by chromatography on bio-gel 5 m ( bio-rad laboratories , richmond , calif. ) .
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