title: Research in reading retardation: two critical problems.
mesh_terms: D002648:Child; D003937:Diagnosis, Differential; D004410:Dyslexia; D004411:Dyslexia, Acquired; D006801:Humans; D008607:Intellectual Disability; D007398:Interpersonal Relations; D008954:Models, Biological; D011159:Population Surveillance; D011594:Psychometrics; D011932:Reading; D014481:United States