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1·Methods: We studied 75 clinically stable patients with a range of severity of airway obstruction and 42 healthy smoker or ex-smoker control subjects, free of cardiovascular disease.

方法：我们研究了75例具有一定严重性的临床稳定期气道阻塞病人，42例吸烟或已经戒烟且没有心血管疾病的健康人作为对照。