- Dr J M Liebler, Pulmonary and Critical Care Medicine Division, Oregon Health Sciences University UHN-67, 3181 S W Sam Jackson Park Road, Portland, Oregon 97201–3098, USA.
- Received September 24, 1997
- Revision requested December 11, 1997
- Revised March 25, 1998
- Accepted May 26, 1998
- First published October 1, 1998.
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