- Dr J B Soriano, Department of Worldwide Epidemiology, GlaxoWellcome R&D, Greenford, Middlesex UB6 0HE, UK email:
- Received October 28, 1999
- Revision requested February 10, 2000
- Revised April 19, 2000
- Accepted June 2, 2000
- First published September 1, 2000.
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