1. Down syndrome: a review of the literature;Desai;Oral Surg Oral Med Oral Pathol Oral Radiol Endod,1997
2. John Langdon Down: Down's syndrome;Ellis;J Perioper Pract,2013
3. Down's syndrome;Allt;British Journal of Anaesthesia,2003
4. On the origin of trisomy 21 Down syndrome;Hultén;Mol Cytogenet,2008
5. Cytogenetic and comorbidity profile of Down syndrome in Mansoura University Children’s Hospital, Egypt;El-Gilany;Indian J Hum Genet,2011