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The effect of helium and oxygen on exercise performance in chronic obstructive pulmonary disease: a randomized crossover trial
Laude EA, Duffy NC, Baveystock C, Dougill B, Campbell MJ, Lawson R, Jones PW, Calverley PM
American Journal of Respiratory and Critical Care Medicine 2006 Apr 15;173(8):865-870
clinical trial
6/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: Yes; 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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