- Dr I D Bijl-Hofland, Department of General Practice and Social Medicine, CARA Research Group, Code 229, University of Nijmegen, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands.
- Received May 8, 1998
- Revision requested June 29, 1998
- Revised August 14, 1998
- Accepted September 4, 1998
- First published January 1, 1999.
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