- Correspondence to: Dr P J Visser, Department of Psychiatry, Academisch Ziekenhuis Maastricht, PO Box 5800, 6202 AZ Maastricht, The Netherlands;
- Received February 28, 2000
- Accepted October 23, 2001
- Revised October 9, 2001
- First published April 1, 2002.
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