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.
The relative changes are expressed as percentages relative to the number of publications (reviews excluded) of the 5-year period 2003–2007.
Criteria B.
