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patients with severe COPD. Eur Respir J 2008;32:796-803. 10. Hansell AL, Walk JA, Soriano JB. What do chronic obstructive pulmonary disease pa- tients die from? A multiple cause coding analysis. Eur Respir J 2003;22:809–14. 11. Leidy NK, Sexton C, Jones PW, et al. Measur- ing respiratory symptoms in ...