- Dr A F G Leentjens, Department of Psychiatry, Maastricht University Hospital, PO Box 5800, 6202 AZ Maastricht, The Netherlands. Telephone 0031 43 3877443; fax: 0031 43 3875444.
- Received March 20, 1997
- Revised September 3, 1997
- Accepted September 5, 1997
- First published March 1, 1998.
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