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.
Participant flow diagram. Demographic information [mean age, gender, mean IQ, mean phe level for the year prior study enrollment, and mean blood phe level change (%) between the baseline and 4-week evaluations] are included for each sub-group.
