References

• “Facts About Down Syndrome.” National Association for Down Syndrome. 2009. 4 December 2009 <http://www.nads.org/pages_new/facts.html>

• Hook, Ernest B., Carothers, Andrew D., Hecht, Christina A. “Elevated Maternal Age-specific Rates of Down Syndrome Liveborn Offspring of Women of Mexican and Central American Origin in California.” Prenatal Diagnosis 19 (1999): 245-251.

• Mitchell, Ron B. “Ear, Nose and Throat Disorders in Children With Down Syndrome” The Laryngoscope 113 (2003): 259-263.

• Read, Stephen G. “World Wide Incidence of Down Syndrome” Learning Disability Research Unit, University of Huddersfield.

• Shriver, Eunice. “Down Syndrome.” National Institute of Child Health and Human Development. 2007. 20 November 2009 <http://www.nichd.nih.gov/health/topics/down_syndrome.cfm>