- Dr M Kilpeläinen, Department of Pulmonary Diseases and Clinical Allergology, Turku University Central Hospital, Kiinamyllynkatu 4-8, FIN-20520 Turku, Finland
- Received September 8, 2000
- Revision requested December 4, 2000
- Revised January 24, 2001
- Accepted February 26, 2001
- First published June 1, 2001.
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