- Dr Y Nakamura, Meakins-Christie Laboratories, McGill University, 3626 St Urbain Street, Montreal, Canada H2X 2P2.
- Received October 6, 1997
- Revision requested December 9, 1997
- Revised February 12, 1998
- Accepted May 20, 1998
- First published October 1, 1998.
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