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<风格面对=“正常”字体大小=“默认”=“100%”>“Reproducibility of 6-minute walking test in patients with COPD”. N.A. Hernandes, E.F.M. Wouters, K. Meijer, J. Annegarn, F. Pitta and M.A. Spruit. <em>Eur Respir J</em> 2011; 38: 261–267.</style>