Differently from healthy subjects, VWF:Ag and VWF:Act levels in patients with PV showed only a nonsignificant trend toward lower values in O versus non‐O blood groups (VWF:Ag: 120 ± 26 vs 105 ± 25 IU/dL; VWF:Act: 114 ± 24 vs 101 ± 17 IU/dL, in non‐O vs O blood groups, respectively; both P = 0.08).
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Increased von Willebrand factor levels in polycythemia vera and phenotypic differences with essential thrombocythemia.
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