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Frequency and clinical relevance of human bocavirus infection in acute exacerbations of chronic obstructive pulmonary diseaseRingshausen, Felix C.; Ringshausen, Felix C.; Tan, Ai-Yui; Allander, Tobias; Borg, Irmgard; Arinir, Umut; Kronsbein, Juliane; Hauptmeier, Barbara; Schultze-Werninghaus, Gerhard; Rohde, Gernot · International Journal of Chronic Obstructive Pulmonary Disease · 2009