- Dr J M FitzGerald, Respiratory Clinic, Vancouver Hospital and Health Sciences Centre, 2775 Heather Street, Vancouver, British Columbia V5Z 1M9, Canada.
- Received August 22, 1997
- Revision requested November 11, 1997
- Revised January 7, 1997
- Accepted January 8, 1997
- First published April 1, 1998.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.