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2. Early prenatal diagnosis in different EEC countries: Italia;Brambati,1986
3. First trimester fetal diagnosis of genetic disorders, clinical evaluation of 250 cases;Brambati;J Med Genet,1985
4. Early prenatal diagnosis in different EEC countries: France;Briard,1986
5. Evaluation of 230 diagnostic chorion villi samplings;Buyatert,1988