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.
(A) Funnel plot for publication bias in the Arg194Trp polymorphism. (B) Funnel plot for publication bias in the Arg399Gln polymorphism. Abbreviations: XRCC1, X-ray repair cross complementing protein 1; OR, odds ratio.
