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Excess twinning occurred for cyclopia and possibly also for sirenomelia. An analysis of associated malformations indicates the similarity between the two conditions, which is in agreement with recent embryological analysis.<\/jats:p>","DOI":"10.1136\/jmg.29.1.30","type":"journal-article","created":{"date-parts":[[2008,11,10]],"date-time":"2008-11-10T15:23:16Z","timestamp":1226330596000},"page":"30-35","source":"Crossref","is-referenced-by-count":68,"title":["The cyclops and the mermaid: an epidemiological study of two types of rare malformation."],"prefix":"10.1136","volume":"29","author":[{"given":"B","family":"K\u00e4ll\u00e9n","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"E E","family":"Castilla","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P A","family":"Lancaster","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"O","family":"Mutchinick","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"L B","family":"Knudsen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M L","family":"Mart\u00ednez-Fr\u00edas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P","family":"Mastroiacovo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"E","family":"Robert","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[1992,1,1]]},"reference":[{"key":"ref_1","first-page":"40","article-title":"Amaliegade 13, PO Box 2020, DK-1012 Copenhagen, Denmark. 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