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.
Graph showing the number of user registrations and forum posts over the 8 weeks, from the initial invitation email to closure of the final discussion thread. The hashtag symbol (#) indicates the first mass invitation email, and asterisk symbols (*) indicate subsequent reminder emails. Reminders generally coincided near the start and midway through each discussion thread but were required less toward the end of the study. Apr: April; Feb: February; Mar: March.
