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.
Communication strategies: (A) enhanced versus standard letter, (B) total design versus customary post, (C) priority versus regular post, (D) additional reminders to participants versus usual follow-up, (E) telephone survey versus monetary incentive and questionnaire.
