CNTNAP2 and attention deficit-hyperactivity disorder: Moreover, we have clinical hints that children, like those with NMDAR antibodies and psychosis (Pathmanandavel et al. 2015) and children with CASPR2 antibodies and mental retardation (Coutino et al. 2017a, b) and 37 and 73 kDa antibodies against fetal brain antibodies in combination with ADHD symptoms (Rossi et al. 2013) might bear clues for an autoimmune disease associated with behavioral abnormalities.