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.
Aerosol bolus deposition of 1 μm-diameter particles in air (open square symbols) and heliox (closed diamond symbols) as a function of penetration volume in healthy subjects (panel A) and mild-to-moderate COPD subjects (panel B). Data are shown as mean ± SD.
