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Cutoff point of duration from bulbar onset to FSLI in 115 bulbar onset ALS patients. The Duration in months from bulbar onset to FSLI in 115 bulbar onset ALS patients was analysed as a candidate for the cutoff point by maximally selected log-rank statistics according to a maximum relative risk and minimum P value. The cutoff duration was 20 months. FSLI = first significant limb involvement; ALS = amyotrophic lateral sclerosis; IBP = isolated bulbar palsy
