- Professor P J Sterk, Lung Function Laboratory, C2-P Department of Pulmonology, Leiden University Medical Center, P O Box 9600, NL-2300 RC Leiden, The Netherlands.
- Received July 3, 1998
- Revision requested October 7, 1998
- Revised November 13, 1998
- Accepted December 8, 1998
- First published May 1, 1999.
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