%0 Journal Article %1 balke2008german %A Balke, B %A Schmoldt, S %A Haussler, S %A Suerbaum, S %A Heesemann, J %A Hogardt, M %D 2008 %J J Cyst Fibros %K haeussler %N 1 %P 7-14 %T A German external quality survey of diagnostic microbiology of respiratory tract infections in patients with cystic fibrosis %V 7