<qa>  What is the main cause of a respiratory disease other than COPD?- Clinically important pulmonary disease other than COPD e.g. active lung infection, clinically significant bronchiectasis, pulmonary fibrosis, cystic fibrosis, hypoventilation syndrome associated with obesity, and primary ciliary dyskinesia and or radiological findings suggestive of a respiratory disease other than COPD that is contributing to the subjects respiratory symptoms. 