1. Department of Internal Medicine, Nagasaki University
2. Division of Infectious Diseases, Department of Infectious Medicine, Kurume University School of Medicine
3. Epidemiology Unit, Ministry of Health
4. Department of Microbiology, University of Peradeniya
5. Department of Social Environment Medicine, Nagasaki University
6. Research Center for Tropical Infectious Diseases, Institute of Tropical Medicine, Nagasaki University