1. GOLD Executive Summary. Updated 2004. www.goldcopd.com.
2. Standards for the diagnosis and care of patients with chronic obstructive pulmonary disease (COPD) and asthma: chronic obstructive pulmonary disease. Am J Respir Crit Care Med 1986;136:225–238.
3. Christie RV. Emphysema of the lungs. BMJ 1944;105–108, 143–146.
4. American Thoracic Society. Chronic bronchitis, asthma, and pulmonary emphysema: a statement by the committee on diagnostic standards for nontuberculosis respiratory diseases. Am Rev Respir Dis 1962;85:762–768.
5. Snider GL, Kleinerman J, Thurlbeck WM, et al. The Definition of Emphysema. Report of a National Heart, Lung, and Blood Institute, Division of Lung Diseases Workshop. NHLBI, 1985:182–185.