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.
Representative example of the Japan NBI Expert Team classification. (a) Invisible vessel pattern and white spots (type 1); (b) regular vessel and surface patterns (type 2A); (c) irregular vessel and surface patterns (type 2B); (d) nearly avascular or loose vascular areas (type 3). NBI: Narrow Band Imaging.
