- Dr F Forastiere, Osservatorio Epidemiologico Regionale, Lazio, Via Santa Costanza 53, 00198 Roma, Italy email:
- Received September 3, 1999
- Revision requested October 15, 1999
- Revised January 5, 2000
- Accepted January 12, 2000
- First published April 1, 2000.
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