1. School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan;
2. San Lazaro Hospital – Nagasaki University Collaborative Research Office, Manila, Philippines;
3. San Lazaro Hospital, Manila, Philippines;
4. Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, England;
5. Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan