- Dr R D’Alessandro, Laboratorio di Neuroepidemiologia. Instituto di Clinica Neurologica, Dell’Università di Bologna, Via Ugo Foscolo 7 (Porta Saragozza, 40123 Bologna, Italy.
- Received February 24, 1997
- Revised January 15, 1998
- Accepted January 23, 1998
- First published August 1, 1998.
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