1. Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan.
2. Department of Viral and Rickettsial Diseases, Infectious Diseases Directorate, Naval Medical Research Center, Silver Spring, Maryland.
3. Department of Preventive Medicine and Biostatistics, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
4. Research and Diagnostic Center, Center for Disease Control, The Ministry of Health and Welfare, Taipei, Taiwan.
5. Taiwan Anti-Malaria Advisory Mission, Sao Tome, Democratic Republic of Sao Tome and Principe.
6. Centro National de Endemias, Sao Tome, Democratic Republic of Sao Tome and Principe.
7. Institute of Environmental Health, College of Public Health, National Taiwan University, Taipei, Taiwan.
8. Department of Public Health, College of Public Health, National Taiwan University, Taipei, Taiwan.