1. Patton MA. Genetics. Forfar & Arneil’s Textbook of Pediatrics Edinburgh: Churchill Livingstone; 2003;407-441.
2. Down JL. Observations on an ethnic classification of idiots. 1866. Ment Retard 1995;33:54-56.
3. Lejeune J, Gauthier M, Turpin R. Human chromosomes in tissue cultures. C R Hebd Seances Acad Sci 1959;248:602-603.
4. Summar K, Lee B. Down syndrome and other abnormalities of chromosome number. Nelson textbook of pediatrics Philadelphia: Saunders; 2011;394-404.
5. Mäki M, Lohi O. Celiac disease. Pediatric gastrointestinal disease Hamilton: BC Decker Inc; 2004;933-943.