- Dr M T M Hu, Medical Research Council Cyclotron Unit, Imperial College School of Medicine, Hammersmith Hospital, Du Cane Rd, London W12 0NN, UK. Telephone 0181 383 3710; Fax 0181 383 2029.
- Received October 12, 1998
- Revised February 8, 1999
- Accepted February 16, 1999
- First published July 1, 1999.
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