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Inspiratory muscle training with a pressure threshold breathing device in patients with chronic obstructive pulmonary disease
Larson JL, Kim MJ, Sharp JT, Larson DA
The American Review of Respiratory Disease 1988 Sep;138(3):689-696
clinical trial
7/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: Yes; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

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