1. Blood Systems Research Institute and
2. Department of Laboratory Medicine; University of California at San Francisco; San Francisco California
3. University of British Columbia; Vancouver British Columbia Canada
4. National Heart, Lung, and Blood Institute, National Institutes of Health; Bethesda Maryland
5. Unit of Emerging Infectious Diseases; Institut Louis Malardé; Tahiti French Polynesia
6. Departmento de Molestias Infecciosas e Parasitarias; Instituto de Medicina Tropical, Universidade de Sao Paulo; Sao Paulo Brazil