1. Nelson, W.E., Vaughan, V.C. &McKay, R.J. (Eds.). Textbook of Pediatrics. 11th ed. Philadelphia: Saunders (1979), p. 352.
2. Carter, C.O. A life-table for mongols with the causes of death. J. Ment. Defic. Res.2. 64 (1958).
3. Fabia, J. &Drolette, M. Life tables up to age of 10 for mongols with and without congenital heart defect. J. Ment. Defic. Res.14: 235 (1970).
4. Chen,A.T.L., Sergovich,F.R., McKim,J.S., Barr, M.L. &Gruber, D. Studies in full-term, low-birth weight, mentally retarded patients. J. Pediatr.76: 393 (1970).
5. Greenwood, R.D. &Nadas, A.S. The clinical course of cardiac disease in Down’s syndrome. Pediatrics58: 893 (1976).