Figure 2.
(a) Breakdown of the number of studies by specimen type. (b) Breakdown of the number of studies by platform of analysis.
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.