- Correspondence to: J S Kalkman Expert Centre Chronic Fatigue (627), Radboud University Nijmegen Medical Centre, PO Box 9101, 6500 HB Nijmegen, Netherlands;
- Received July 16, 2004
- Accepted January 13, 2005
- Revised January 13, 2005
- First published September 16, 2005.
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