- Professor DH Miller, NMR Research Unit, Institute of Neurology, Queen Square, London WC1N 3BG, UK. Telephone 0044 171 837 3611 ext 3991; fax 0044 171 278 5616.
- Received February 26, 1997
- Revised July 11, 1997
- Accepted July 23, 1997
- First published February 1, 1998.
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