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.
NHANES = Third National Health and Nutrition Examination Survey; SDLT = Serial Digit Learning Test; SDST = Symbol Digit Substitution Test; SRTT = Simple Reaction Time Test; US = ultrasonography.
