Figure 1.
(a) Follow-up rate; IFU = in follow-up; y. = year; mo. = months; n = number. (b) Follow-up status; IFU = in follow-up; LTFU = lost to follow-up.
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.