Michael Rutter, Karen Thorpe, Rosemary Greenwood, Kate Northstone and Jean Golding Twins as a natural experiment to study the causes of mild language delay: I: Design; twin–singleton differences in language, and obstetric risks Journal of Child Psychology and Psychiatry 44
Article first published online: 6 FEB 2003 | DOI: 10.1111/1469-7610.00125
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