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) Forest plot of the association between C9orf72 repeat expansions and familial ALS. (b) Forest plot of the association between C9orf72 repeat expansions and sporadic ALS. (c) Forest plot of the association between C9orf72 repeat expansions and ALS (subgroup analysis).
