NEFL and amyotrophic lateral sclerosis: We herein conducted additional analysis of the same cohorts of ALS patients and biomarker dataset with the aim of comprehensively elucidating the association with clinical findings and mutual associations of CSF and plasma NfL, TDP-43, and t-tau levels in ALS patients, because such clinico-biomarker and mutual-biomarker associations were insufficiently investigated in the initial study.