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Asthma in adults and its association with chronic rhinosinusitis: the GA2LEN survey in Europe

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General Info
Geography 
Belgium (BEL)
Denmark (DNK)
Finland (FIN)
France (FRA)
Germany (DEU)
Italy (ITA)
Sicilia
Poland (POL)
Małopolskie, Łódzkie, Śląskie
Portugal (PRT)
Sweden (SWE)
England
Time period covered 
01/2008 - 12/2009
Keywords