- Dr A Torres, Hospital Clinic I Provincial, Servei de Pneumologia I Al.lèrgia Respiratoria, Villarroel 170, E-08036 Barcelona, Spain
- Received March 5, 1999
- Revision requested June 11, 1999
- Revised July 28, 1999
- Accepted September 7, 1999
- First published January 1, 2000.
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