- Professor Antonio Carolei, Clinica Neurologica, Dipartimento di Medicina Interna e Sanità Pubblica, Università degli Studi di L'Aquila, 67100 L'Aquila, Coppito, Italy
- Received 30 March 1999
- Revised 20 July 1999
- Accepted 5 August 1999
- Published online 1 March 2000.
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