Figure 1. Study flowchart showing the identification and selection of eligible studies.
ABO-OGS, Objective Grading System (OGS) proposed by the American Board of Orthodontics.
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.