title: [Surveillance of congenital malformations. Monitoring of polydactyly using the Chen method].
abstract: The Chen method was adopted to monitor the principal congenital malformations in a large peripheric center. In 1982 two consecutive alarms showed an evident increase in the prevalence at birth of polydactylia. A retrospective analysis of the main risk factors failed to satisfactorily explain this increase.
mesh_terms: D004812:Epidemiologic Methods; D005385:Fingers / Q000002:abnormalities*; D006801:Humans; D007231:Infant, Newborn; D007558:Italy; D012306:Risk; D014034:Toes / Q000002:abnormalities*
vernacular_title: La sorveglianza delle malformazioni congenite. Monitoraggio della polidattilia con il metodo Chen.