Reference:
Cartwright KL, Bitsakou P, Daley D, Gramzow RH, Psychogiou L, Simonoff E, Thompson MJ, Sonuga-Barke EJ. Disentangling child and family influences on maternal expressed emotion toward children with attention-deficit/hyperactivity disorder. Journal of the American Academy of Child and Adolescent Psychiatry 2011;50(10): 1042-1053.