title: Exercise limitation in chronic obstructive pulmonary disease. The O'Donnell threshold.
authors: 1 Rehabilitation Clinical Trials Center Los Angeles Biomedical Research Institute at Harbor-University of California, Los Angeles, Medical Center Torrance, California.
authors: Richard
authors: R
authors: Casaburi
authors: Stephen I
authors: SI
authors: Rennard
mesh_terms: D006801:Humans; D012119:Respiration