[Productive cough].

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@article{Drst1985ProductiveC, title={[Productive cough].}, author={A D{\"{u}rst and Tullio C. Medici and William J. Vetter}, journal={Schweizerische Rundschau für Medizin Praxis = Revue suisse de médecine Praxis}, year={1985}, volume={74 29}, pages={794-7} }