Protective effect of a bacterial extract against acute exacerbation in patients with chronic bronchitis accompanied by chronic obstructive pulmonary disease. [electronic resource]

By: Contributor(s): Producer: 20041102Description: 828-34 p. digitalISSN:
  • 0366-6999
Subject(s): In: Chinese medical journal vol. 117
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Publication Type: Clinical Trial; Journal Article; Randomized Controlled Trial

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