Plasma theophylline concentrations, six minute walking distances, and breathlessness in patients with chronic airflow obstructionBr Med J (Clin Res Ed) 1985; 290 doi: https://doi.org/10.1136/bmj.290.6462.159-a (Published 12 January 1985) Cite this as: Br Med J (Clin Res Ed) 1985;290:159
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