Research Article
Plasma theophylline concentrations, six minute walking distances, and breathlessness in patients with chronic airflow obstruction.
Br Med J (Clin Res Ed) 1984; 289 doi: https://doi.org/10.1136/bmj.289.6459.1649 (Published 15 December 1984) Cite this as: Br Med J (Clin Res Ed) 1984;289:1649
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