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Introduction: Recurrent bleeding in severe haemophilia B causes painful hemarthroses and reduces capacity for physical activity. Recombinant factor IX Fc fusion protein (rFIXFc) prophylaxis results in low annualised bleeding rates, with the potential to improve patients’ health-related quality of life (HRQoL). Aim: To present a post hoc analysis of data from B-LONG describing change over time in p
