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25. Chronic bronchitis and emphysema. Classification and epidemiology. Ferris B Med Clin North Am; 1973 May; 57(3):637-49. PubMed ID: 4573462 [No Abstract] [Full Text] [Related]
26. Chronic bronchitis and emphysema. Thurlbeck WM Med Clin North Am; 1973 May; 57(3):651-68. PubMed ID: 4573463 [No Abstract] [Full Text] [Related]