- Dr Irene Litvan, Neuropharmacology Unit, Defense and Veteran Head Injury Program, Henry M Jackson Foundation, Federal Building, Room 714, Bethesda, MD 20892–9130, USA.
- Received October 26, 1998
- Revised February 1, 1999
- Accepted February 10, 1999
- First published November 1, 1999.
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