- Dr F L Dente, Ospedale di Cisanello, Dipartimento di Cardiologia Angiologia e Pneumologia, U.O. di Fisiopatologia Respiratoria, via Paradisa 2, 56100 Pisa, Italy.
- Received June 24, 1998
- Revision requested August 28, 1998
- Revised March 18, 1999
- Accepted March 22, 1999
- First published July 1, 1999.
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