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Effects of singing classes on pulmonary function and quality of life of COPD patients
Bonilha AG, Onofre F, Vieira ML, Prado MYA, Martinez JAB
International Journal of Chronic Obstructive Pulmonary Disease 2009 Apr 15;4:1-8
clinical trial
4/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; 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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