title: [Infection with virus or atypical pathogen is less often a cause of chronic bronchitis than expected].
authors.forename: W G
authors.initials: WG
authors.lastname: Boersma
authors.forename: C S
authors.initials: CS
authors.lastname: de Graaff
mesh_terms: D016993:Chlamydophila pneumoniae / Q000302:isolation & purification; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000382:microbiology* / Q000821:virology*; D009177:Mycoplasma pneumoniae / Q000302:isolation & purification; D014777:Virus Diseases / Q000821:virology