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Summary
Background
Hereditary thrombotic thrombocytopenic purpura (TTP) caused by ADAMTS‐13 mutations is a rare, but serious condition. The prevalence is unknown, but it seems to be high in Norway.
Objectives
To identify all patients with hereditary TTP in central Norway and to investigate the prevalence of hereditary TTP and the population frequencies of two common ADAMTS‐13 mutations.
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