- Professor A Pesci, Istituto di Clinica delle Malattie dell’Apparato Respiratorio, Via Rasori 10, 43100 Parma, Italy.
- Received June 4, 1998
- Revision requested October 15, 1998
- Revised January 4, 1999
- Accepted January 29, 1999
- First published July 1, 1999.
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