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chronic obstructive pulmonary disease wikipedia - the most common symptoms of copd are sputum production shortness of breath and a productive cough these symptoms are present for a prolonged period of time and typically worsen over time it is unclear whether different types of copd exist while previously divided into emphysema and chronic bronchitis emphysema is only a description of lung changes rather than a disease itself and, http www great books dwld ru new html - , essay writing service essayerudite com custom writing - about us we value excellent academic writing and strive to provide outstanding essay writing services each and every time you place an order we write essays research papers term papers course works reviews theses and more so our primary mission is to help you succeed academically