- Dr M L Aitken, Division of Pulmonary and Critical Care Medicine, Box 356522, 1959 NE Pacific Street, Room BB1253, Seattle, WA 98195–6522, USA
- Received June 16, 2000
- Revision requested September 21, 2000
- Revised November 8, 2000
- Accepted January 5, 2001
- First published April 1, 2001.
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