_:vb50943888 "An inflammatory bowel disease that has_material_basis_in variation in the chromosome region 18p11."^^ . _:vb50943888 . _:vb50943888 . _:vb50943888 . _:vb50943888 . _:vb50943888 . _:vb50943888 "url:https://www.ncbi.nlm.nih.gov/pubmed/17554261"^^ .