?:definition
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A standardized rating scale developed by Celli et al in 2004, which is a multidimensional grading system used to assess the respiratory and systemic expressions of COPD, and to predict the risk of death among patients with COPD. This instrument has a total possible values range from 0 to 10, based on FEV1, body-mass index, the distance walked in six minutes, and the modified MRC dyspnea scale.
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