[The cardinal symptom. Difficulties in concentration of schoolchildren].
D000293:Adolescent; D001288:Attention; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000523:psychology / Q000628:therapy; D002648:Child; D006801:Humans; D011599:Psychopathology
Sintoma cardinal. Dificuldades de concentração de crianças em idade escolar.