_:vb50939079 . _:vb50939079 . _:vb50939079 "A von Willebrand's disease characterized by quantitative partial deficiency of circulating VWF that has material_basis_in heterozygous mutation in the VWF gene on chromosome 12p13."^^ . _:vb50939079 . _:vb50939079 "url:https://www.ncbi.nlm.nih.gov/pubmed/16889557"^^ . _:vb50939079 . _:vb50939079 "url:https://www.ncbi.nlm.nih.gov/pubmed/8456432"^^ . _:vb50939079 .