Articulation proficiency in twins and singletons from families of twins.
D001722:Birth Order; D002648:Child; D002675:Child, Preschool; D002658:Developmental Disabilities / Q000235:genetics*; D005260:Female; D006801:Humans; D007804:Language Development; D008297:Male; D010700:Phonetics; D011247:Pregnancy; D011581:Psychological Tests; D012959:Socioeconomic Factors; D013060:Speech; D013637:Tape Recording; D014427:Twins