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In page Congenital heart defect:
"Rokitansky (1875) explained congenital heart defects as breaks in heart development at various ontogenesis stages.[1] Spitzer (1923) treats them as returns to one of the phylogenesis stages.[2] Krimski (1963), synthesizing two previous points of view, considered congenital heart diseases as a stop of development at the certain stage of ontogenesis, corresponding to this or that stage of the phylogenesis.[3] Hence, these theories can explain feminine and neutral types of defects only.[citation needed]
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