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International variation in the prevalence of COPD (the BOLD Study): a population-based prevalence study

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General Info
Geography 
Australia (AUS)
Austria (AUT)
Canada (CAN)
China (CHN)
Guangdong
Estonia (EST)
Germany (DEU)
Iceland (ISL)
India (IND)
Norway (NOR)
Manila
Poland (POL)
Portugal (PRT)
Western Cape
Sweden (SWE)
Türkiye (TUR)
Time period covered 
01/2003 - 12/2009