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N. R. BergquistWorld Health Organization, Geneva, Switzerland; Prince Leopold Institute of Tropical Medicine, Antwerp, Belgium; Centre for the Epidemiology of Infectious Diseases, University of Oxford, Oxford, United Kingdom

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B. GryseelsWorld Health Organization, Geneva, Switzerland; Prince Leopold Institute of Tropical Medicine, Antwerp, Belgium; Centre for the Epidemiology of Infectious Diseases, University of Oxford, Oxford, United Kingdom

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H. GuyattWorld Health Organization, Geneva, Switzerland; Prince Leopold Institute of Tropical Medicine, Antwerp, Belgium; Centre for the Epidemiology of Infectious Diseases, University of Oxford, Oxford, United Kingdom

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Author Notes

Authors' addresses: N. R. Bergquist, TDR Programme, World Health Organization, CH-1211 Geneva 27, Switzerland. B. Gryseels, Prince Leopold Institute of Tropical Medicine, Nationalestraat 155, B-2000 Antwerp, Belgium. H. Guyatt, Centre for the Epidemiology of Infectious Diseases, University of Oxford, South Parks Road, Oxford OXI 3PS, United Kingdom.

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