- Dr D C J J Bergmans, Department of Internal Medicine, University Hospital Maastricht, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands.
- Received 9 February 1998
- Revision requested 18 May 1998
- Revised 17 June 1998
- Accepted 6 July 1998
- Published online 1 December 1998.
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