1. Department of Medicine, Neurology Division, Duke University Medical Center, Durham, NC 27710.
2. Department of Psychiatry, Duke University Medical Center, Durham, NC 27710.
3. Harbor UCLA Medical Center, Los Angeles, CA 90509
4. Childrens Hospital, Boston, MA 02115.
5. Laval University, Quebec, Canada, G1V 462.
6. Concord Hospital, Concord 2139, New South Wales, Australia.