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 flow diagram of the literature search and selection. (a) Flow chart for the search for systematic literature reviews with meta-analyses for all color pigments. (b) Flow chart for the search for randomized controlled trials and cohort studies for the green pigment chlorophyll.
