- Dr Y Lacasse, Centre de Pneumologie, Hôpital Laval, 2725 Chemin Ste-Foy, Ste-Foy, P. Quebec, G1V 4G5, Canada.
- Received October 23, 1998
- Revision requested January 12, 1999
- Revised April 1, 1999
- Accepted June 10, 1999
- First published October 1, 1999.
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