Figure 1.
Written information on smoking behavior of 310 pregnant women in Berlin 2001–2002; with kind permission and modified after [4].
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.