- Dr Giovanni Gambassi, Center for Gerontology and Health Care Research, Brown University-Box G-B213, Providence, RI 02912, USA. Telephone 001 401 863 3211, or 3491; fax 001 401 863 3489; email
- Received July 1, 1998
- Revised November 24, 1998
- Accepted January 8, 1999
- First published July 1, 1999.
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