1. Talamo, R. C., Rosenstein, B. J. & Berninger, R. W. in The Metabolic Basis of Inherited Disease 5th edn (eds Stanbury, J. B. et al.) 1889–1917 (McGraw-Hill, New York, 1983).
2. Danks, D. M., Phelan, P. D. & Chapman, C. Am. J. hum. Genet. 36, 1389–1402 (1984).
3. Romeo, G. et al. Am. J. hum. Genet. 37, 338–349 (1985).
4. Tsui, L.-C. et al. Science (in the press).
5. Schmiegelow, K. et al. Lancet (in the press).