NEFH and amyotrophic lateral sclerosis: 409; ECAS amyotrophic lateral sclerosis-specific score: r = −0.101, P = 0.393; amyotrophic lateral sclerosis-non-specific score: r = −0.066, P = 0.579) and neurofilament heavy chains (ECAS total score: r = −0.094, P = 0.424; ECAS amyotrophic lateral sclerosis-specific score: r = −0.102, P = 0.383; amyotrophic lateral sclerosis-non-specific score: r = −0.052, P = 0.656).