The effect of activated prothrombin-complex concentra-te (Feiba) on joint and muscle bleed in patients with hemophilia A and antibodies to factor VIII - Sjamsoedin, E J; Heijmen, L; Mauser-Bunschoten, E P; van Geijlswijk, J L; van Asten, P; Sixma, J J (N Engl J Med, 1981)