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.
PRISMA Literature Selection Flow Diagram
Notes: a) We included only randomized controlled trials, cohort studies, and case control studies that were published in a peer-review journal, written in English, and involved human subjects. Included articles also contained at least one age-related risk factor as an independent variable.
