C9orf72 and amyotrophic lateral sclerosis: The purpose of the case-control analysis was to 1) identify best SNPs tagging the C9orf72 HRE and intermediate-length alleles, 2) two analyze the association of these SNPs with ALS risk after exclusion of cases with HRE and 3) to analyze the association with ALS risk in Finland using the top SNPs identified in other European populations.