- Dr P Lange, Department of Respiratory Medicine 223, Hvidovre Hospital, Kettegaard alle 30, DK-2650 Hvidovre, Denmark email:
- Received February 28, 2000
- Revision requested April 18, 2000
- Revised June 21, 2000
- Accepted July 3, 2000
- First published October 1, 2000.
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