Total number of subjects for each condition in TDCS studies. SCH, schizophrenia; ASD, autism spectrum disorder; ADHD, attention-deficit hyperactivity disorder; CP, cerebral palsy. (Data from Palm U, Segmiller FM, Epple AN, et al. Transcranial direct current stimulation in children and adolescents: a comprehensive review. J Neural Transm 2016;123(10):1219–34; and Muszkat D, Polanczyk GV, Dias TG, et al. Transcranial direct current stimulation in child and adolescent psychiatry. J Child Adolesc Psychopharmacol 2016;26(7):590–7.)