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 Po Valley regions: Piemonte, Lombardia (with blue borders), Veneto and Emilia-Romagna. The city of Brescia is represented by the red area. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
