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.
A comparison is shown between the use of three different ultrasound probe types and an unspecified probe in the studies, between (a) study year, and (b) S. mansoni and S. japonicum. The numbers shown above each bar are the numbers of studies that used each ultrasound probe type.
