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.
Flow diagram of clinical trial participants describing smoking and treatment status. CLO = clonidine; NONTX/CLO = no naltrexone–no clonidine; NTX = naltrexone; NTX/CLO = naltrexone + clonidine. *Patients receiving the two naltrexone doses were combined into a single naltrexone treatment condition as reported in Results section.
