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.
Mapping of controlled clinical trials on spine; Y-axis: Assessed intervention; X-axis: rating of conclusions; bubble size: number of patient included in each CCT; bubble color: Risk of bias (RoB) assessment (Green= low RoB; Yellow= unclear RoB; Red= high RoB).
