- Correspondence to:
Professor R de Marco
Sezione di Epidemiologia & Statistica Medica, Dipartimento di Medicina e Sanità Pubblica, Università degli Studi di Verona, c/o Istituti Biologici II, Strada Le Grazie 8, 37134 Verona, Italy;
- Received June 5, 2003
- Accepted October 29, 2003
- First published February 3, 2004.
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