- Correspondence to: Professor Mario Pirisi, Universitá del Piemonte Orientale “Amedeo Avogadro”, Dipartimento di Scienze Mediche, Via Solaroli 17, 28100 Novara (NO), Italy;
- Received July 2, 2001
- Accepted November 27, 2001
- First published April 1, 2002.
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