- Professor D Sillence, Department of Clinical Genetics, Royal Alexandra Hospital for Children, PO Box 3515, Parramatta, NSW 2124, Australia. Telephone 0061 2 9845 3273; fax 0061 2 9845 3204.
- Received March 2, 1998
- Revised June 3, 1998
- Accepted July 8, 1998
- First published March 1, 1999.
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