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2. Stevenson, R. E., Schwartz, C. E. & Schroer, R. J. X-Linked Mental Retardation (Oxford Univ. Press, 2000).An excellent and timely book that gives an extensive overview of epidemiological studies and clinical descriptions of all XLMR syndromes.
3. McLaren, J. & Bryson, S. E. Review of recent epidemiological studies of mental retardation: prevalence, associated disorders, and etiology. Am. J. Ment. Retard. 92, 243–254 (1987).
4. Shaffer, L. G., Ledbetter, D. H. & Lupski, J. R. in The Metabolic and Molecular Bases of Inherited Disease Vol. I (eds Scriver, C. R., Beaudet, A. L., Sly, W. S. & Valle, D.) 1291–1326 (McGraw–Hill, New York, 2001).
5. Donnai, D. & Karmiloff-Smith, A. Williams syndrome: from genotype through to the cognitive phenotype. Am. J. Med. Genet. 97, 164–171 (2000).