title: [Study on the epidemiological difference of four kinds of chronic respiratory disease in the urban and rural areas of China].
authors.affiliation: Department of Respiratory Medicine, the People's Hospital, Peking University, Beijing, China.
authors.forename: Quan-ying
authors.initials: QY
authors.lastname: He
authors.forename: Yan-liang
authors.initials: YL
authors.lastname: Ma
authors.forename: Rong-bao
authors.initials: RB
authors.lastname: Zhang
authors.forename: Rui-hong
authors.initials: RH
authors.lastname: Yang
authors.forename: Xin-lin
authors.initials: XL
authors.lastname: Mu
mesh_terms: D002681:China / Q000453:epidemiology; D002908:Chronic Disease; D006801:Humans; D012140:Respiratory Tract Diseases / Q000453:epidemiology*; D012424:Rural Population; D014505:Urban Population