title: [Epidemilogical investigation of pneumoconiosis characteristics in Ningxia from 2002 to 2006].
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.forename: Fu-Hai
authors.initials: FH
authors.lastname: Ma
authors.forename: Guan-Mei
authors.initials: GM
authors.lastname: Wang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002681:China / Q000453:epidemiology; D006801:Humans; D008875:Middle Aged; D011009:Pneumoconiosis / Q000453:epidemiology*