Stuttering and its disappearance.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002140:California; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011678:Punishment; D012054:Reinforcement, Psychology; D013070:Speech Therapy; D013223:Statistics as Topic; D013333:Student Health Services; D013334:Students; D013342:Stuttering / Q000453:epidemiology* / Q000235:genetics; D013997:Time Factors