“VWD happens when the body doesn’t have enough von Willebrand factor, a protein that helps platelets stick together to form clots,” said Ozawa. “People with VWD may bleed longer than usual ...

Antiphospholipid antibodies (present in the serum of patients with APS) are known to induce platelet activation and the production of procoagulants such as von Willebrand factor, thereby ...