C9orf72 and amyotrophic lateral sclerosis: A Slovenian study of patients in Eastern/Central European countries detected a rate of 5.9% pathogenic C9orf72 expansions among ALS patients (5 of 85 cases) [19], and recently in a cohort of Serbian patients with early-onset dementia, the C9orf72 hexanucleotide expansion was detected in 4 of 117 (3.4%) patients [20].