- Correspondence to: Dr Jean-Charles Lambert Unité INSERM 508 Institut Pasteur de Lille 1, rue du Pr Calmette BP 245, 59019 Lille Cedex, France;
- Received April 23, 2003
- Accepted June 21, 2003
- Revised June 13, 2003
- First published February 13, 2004.
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