Fig. 1.
Flow chart. The reasons for ineligibility and the numbers of ineligible participants were shown on the right arrow. The numbers of potential eligible participants were connected through the down arrow.
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.