Diagnosing chronic obstructive pulmonary disease. The importance of differentiating asthma, emphysema, and chronic bronchitis.
Martinez FJ. Diagnosing chronic obstructive pulmonary disease. The importance of differentiating asthma, emphysema, and chronic bronchitis. Postgrad Med. 1998 Apr; 103(4):112-7, 121-2, 125.