NEFL and multiple sclerosis: Increased Nf‐L levels were found in neurological diseases including human spinal cord injury (Kuhle, Gaiottino, et al., 2015), multiple sclerosis, and various neurodegenerative diseases (Kuhle, Disanto, et al., 2015; Petzold, 2005; Sjogren et al., 2000).