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An international survey of chronic obstructive pulmonary disease in young adults according to GOLD stages

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General Info
Geography 
Australia (AUS)
Belgium (BEL)
Canada (CAN)
Denmark (DNK)
Estonia (EST)
France (FRA)
Germany (DEU)
Iceland (ISL)
Ireland (IRL)
Italy (ITA)
Lombardy
Norway (NOR)
Piedmont
Poland (POL)
Spain (ESP)
Sweden (SWE)
Veneto
Time period covered 
01/1994 - 12/1996