Investigations on incidence and symptomatology of cluttering.
D000367:Age Factors; D001307:Auditory Perception; D002648:Child; D004812:Epidemiologic Methods; D005246:Feedback; D005859:Germany, East; D006801:Humans; D008403:Mass Screening; D009043:Motor Activity; D011581:Psychological Tests; D013064:Speech Disorders / Q000175:diagnosis* / Q000453:epidemiology*; D013850:Thinking; D014705:Verbal Behavior; D014956:Writing