- Dr J A van Noord, Department of Respiratory Diseases, Atrium Medisch Centrum, Henri Dunantstraat 5, 6419 PC Heerlen, The Netherlands
- Received July 12, 1999
- Revision requested August 27, 1999
- Revised December 16, 1999
- Accepted December 16, 1999
- First published April 1, 2000.
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