Subjects: Foreign Countries; Genetics; TwinsGreece
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Subjects: Swedish; Sign Language; Longitudinal Studies
Subjects: School Readiness; Child Language; Genetics
Subjects: Adopted Children; Emotional Response; Family Environment
Subjects: Etiology; Educational Attainment; Twins
Subjects: Language Skills; Writing Skills; Academic AchievementCanadaPeabody Picture Vocabulary Test; Wechsler Intelligence Scale for Children
Subjects: Twins; Language Impairments; Developmental Delays
Subjects: Thinking Skills; Reading Skills; Reading DifficultiesColorado
Subjects: Communication Research; Comparative Analysis; Family Environment
Subjects: Behavior Problems; Positive Attitudes; Personality TraitsArizonaInterpersonal Reactivity Index