title: Cleft-twin sets in Finland 1948-1987.
authors.forename: K
authors.initials: K
authors.lastname: Christensen
authors.forename: P
authors.initials: P
authors.lastname: Fogh-Andersen
mesh_terms: D002971:Cleft Lip / Q000235:genetics*; D002972:Cleft Palate / Q000235:genetics*; D003718:Denmark; D005387:Finland; D006801:Humans; D018433:Twin Studies as Topic