This study indicates a frequency of CL/P close to the findings in East Asian countries and higher than some previous reports from Iran, European and American countries. Ethnicity-related genetic factors may have a role in the conflicting results obtained from different populations.
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Elisa Calzolari, Anna Pierini, Gianni Astolfi et al. · American Journal of Medical Genetics Part A · 2007 · 239 citations · Full text
Updating the Epidemiology of Cleft Lip with or without Cleft Palate
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