Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Frequency of COPD exacerbation and presence of airway lumen-obliterated emphysema (ALOE).
Notes: Frequencies of COPD exacerbation are compared in patients with or without ALOE. Horizontal bars represent mean values.
Abbreviation: COPD, chronic obstructive pulmonary disease.
