title: MZA twins: their use and abuse. From Newman to Burt--a decline?
mesh_terms: D000367:Age Factors; D001699:Biometry; D002668:Child Rearing; D005260:Female; D005823:Genetics; D006801:Humans; D007360:Intelligence; D008137:Longitudinal Studies; D008297:Male; D010551:Personality; D011247:Pregnancy; D012107:Research Design; D012923:Social Class; D012931:Social Environment; D014427:Twins; D014430:Twins, Monozygotic