Longevity of a brain-computer interface for amyotrophic lateral sclerosis by Vansteensel, MJ, Leinders, S, Branco, MP, Crone, NE, Denison, T, Freudenburg, ZV, Geukes, SH, Gosselaar, PH, Raemaekers, M, Schippers, A, Verberne, M, Aarnoutse, EJ, Ramsey, NF