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Inspiratory muscle training with a weighted incentive spirometer in subjects with chronic airways obstruction
Gregg BL
Respiratory Care 1989 Oct;34(10):860-867
clinical trial
4/10 [Eligibility criteria: No; Random allocation: No; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; 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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