Figure 1.
Flow chart of search outcomes and selection process of articles on the health status of widows and widowers (Moher et al., 2009)
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.