_:vb50956500 . _:vb50956500 "url:http://www.aafa.org/display.cfm?id=8&sub=17"^^ . _:vb50956500 "url:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1532783/pdf/califmed00272-0002b.pdf"^^ . _:vb50956500 . _:vb50956500 . _:vb50956500 . _:vb50956500 "A chronic asthma that is triggered by factors not attributable to allergies."^^ . _:vb50956500 . _:vb50956500 "url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4099102/"^^ .