Copd and pneumonia in the elderly, end stage copd and pneumonia, copd and pneumonia treatment, copd and pneumonia complications, difference between copd and pneumonia, pathophysiology of copd and pneumonia, copd and pneumonia coding guidelines, copd and pneumonia vaccine, copd and pneumonia life expectancy, severe copd and pneumonia, copd and pneumonia, copd and emphysema, copd and congestive heart failure, copd and oxygen, copd and weight loss, copd and smoking, copd and exercise, copd and disability, difference between copd and asthma, treatment for copd and emphysema,