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<风格面对=“正常”字体大小=“默认”=“100%”>“RELATIONSHIP BETWEEN RESPIRATORY SYMPTOMS AND MEDICAL TREATMENT IN EXACERBATIONS OF COPD”. P. CALVERLEY, R. PAUWELS, C-G. LÖFDAHL, K. SVENSSON, T. HIGENBOTTAM, L-G. CARLSSON AND E. STÅHL. <em>EUR RESPIR J</em> 2005; 26: 406–413.</style>