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.
The dose of alfentanil in all consecutive (A) male and (B) female patients for painless bronchoscopy. The response of each patient is represented with a white or black circle (black, negative; white, positive). Arrows indicate the inflection point from positive responses to negative responses, with 7 inflection points completed in each group.
