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Because polydactyly is relatively common, Castilla et al analyzed its association with other congenital anomalies. From 1967–1993, 5,927 (1.89 per 1,000) polydactyly cases were identified among 3,129,297 consecutive registered births weighing more than 500g in Brazil and Argentina. The polydactyly was classified as duplicated fifth digit (postaxial), duplicated first digit (preaxial type-I) and rare types. In addition, …
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