This protocol, to be carried out at Weill Cornell Medical College - Qatar and Hamad Medical Corporation, Qatar, parallels a similar approved protocol IRB #0005004440, entitled, "Evaluation of the Lungs of Individuals with Lung Disease with Segmental Bronchopulmonary Lung Lavage, Bronchial Brushing, and Bronchial Wall Biopsy", ongoing at Weill Cornell Medical College - New York.