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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)
Åland Islands
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