Figure 1.
Flow diagram of article selection following literature searches in PubMed, LILACS, TRIP database, the GFMER guidelines repository, references check and contributions from experts. Date of last search April 2014.
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.