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Introduction
Primary prophylaxis is the gold standard in severe haemophilia A (SHA) but time to escalate the prophylaxis regimen varies.
Aim
Assess prophylaxis implementation and long‐term joint health outcomes in SHA with primary prophylaxis.
Methods
Adult male patients born after 1980, with SHA on primary prophylaxis, started before the age of 3 years and second joint bleed, and no history...