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Q20 - Congenital malformations of cardiac chambers and connections
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Q21 - Congenital malformations of cardiac septa
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Q22 - Congenital malformations of pulmonary and tricuspid valves
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Q23 - Congenital malformations of aortic and mitral valves
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Q24 - Other congenital malformations of heart
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Q25 - Congenital malformations of great arteries
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Q26 - Congenital malformations of great veins
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Q27 - Other congenital malformations of peripheral vascular system
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Q28 - Other congenital malformations of circulatory system
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