The Mabel Liddiard memorial lecture 1989. Twins in the family.
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D005190:Family; D005260:Female; D006801:Humans; D007223:Infant; D007224:Infant Care; D007231:Infant, Newborn; D008297:Male; D012657:Self-Help Groups; D012801:Sibling Relations; D014427:Twins / Q000523:psychology; D014430:Twins, Monozygotic / Q000523:psychology; D006113:United Kingdom