_:vb50941561 . _:vb50941561 . _:vb50941561 . _:vb50941561 "url:https://pubmed.ncbi.nlm.nih.gov/30033911/"^^ . _:vb50941561 . _:vb50941561 "An urticaria that is characterized by the presence of urticaria for a period exceeding 6 weeks, assuming symptoms for most days of the week."^^ .