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15. Inspiratory muscle training in patients with chronic obstructive pulmonary disease. Kim MJ, Larson JL, Covey MK, Vitalo CA, Alex CG, Patel M. Nurs Res; 1993 Nov; 42(6):356-62. PubMed ID: 8247819 [Abstract] [Full Text] [Related]
16. The respiratory muscles in emphysema. Sharp JT. Clin Chest Med; 1983 Sep; 4(3):421-32. PubMed ID: 6227445 [No Abstract] [Full Text] [Related]