Persistent Aspergillus fumigatus infection in cystic fibrosis: impact on lung function and role of treatment of asymptomatic colonization—a registry-based case–control study oleh Axel Blomquist, Malin Inghammar, Mahasin Al Shakirchi, Petrea Ericson, Christina Krantz, Marcus Svedberg, Anders Lindblad, Lisa I. Påhlman