_:vb50947974 . _:vb50947974 "A lower respiratory tract disease that affects the airways leading into the lungs, which is caused due to inflammation of the bronchi and bronchioles, infection, or blockage."^^ . _:vb50947974 "url:https://www.ncbi.nlm.nih.gov/pubmed/11685087"^^ . _:vb50947974 . _:vb50947974 . _:vb50947974 . _:vb50947974 .