- Associate Professor D R Royall, Department of Psychiatry, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, Texas 78284–7792, USA. Telephone 001 210 567 8545; fax 001 210 567 8509; email:
- Received April 11, 1997
- Revised July 29, 1997
- Accepted October 3, 1997
- First published May 1, 1998.
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