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.
Schematic illustration of the experimental protocol. CPT, cold pressor test; inh., inhalation; NaCl, saline 0.9%; treatment F25, fentanyl 25 μg i.v.; treatment F50, fentanyl 50 μg i.v.; treatment M, inhaled methoxyflurane 3 ml; treatment P, placebo.
