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1 Introduction Acquired haemophilia A (AHA) is a rare autoimmune bleeding disorder, with an estimated prevalence of approximately 1.5 cases per million people per year, caused by the formation of neutralizing autoantibodies (inhibitors) directed against coagulation factor VIII (FVIII) [1]. AHA is characterized by unexpected haemorrhagic manifestations of sudden onset and unusual intensity in patients with no previous family or personal history of bleeding.
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