- Dr L A Hansen, Department of Pathology, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093–0624, USA. Telephone 001 619 534 6212; fax: 001 619 534 6232; email:
- Received August 27, 1997
- Revised October 7, 1997
- Accepted October 16, 1997
- First published May 1, 1998.
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