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References
Article:Targeted Inspiratory Muscle Training Improves Respiratory Muscle Function and Reduces Dyspnea in Patients with Chronic Obstructive
Pulmonary Disease
Andrew Harver,
Donald A. Mahler,
and J. Andrew Daubenspeck
Ann Intern Med July 15, 1989 111:117-124; doi:10.1059/0003-4819-111-2-117