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Abstract
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1 Graduate School of Biomedical Sciences, Nagasaki University, Department of Clinical Tropical Medicine, Institute of Tropical Medicine, Nagasaki, Japan (GRID:grid.174567.6) (ISNI:0000 0000 8902 2273)
2 National Institute of Hygiene and Epidemiology, Hanoi, Vietnam (GRID:grid.419597.7) (ISNI:0000 0000 8955 7323)
3 Invalids and Social Affairs of Khanh Hoa Province, Department of Labor, Nha Trang, Vietnam (GRID:grid.174567.6)
4 Nagasaki University, Department of Pediatrics, Graduate School of Biomedical Sciences, Nagasaki, Japan (GRID:grid.174567.6) (ISNI:0000 0000 8902 2273)
5 Nagasaki University, Department of Global Health, School of Tropical Medicine and Global Health, Nagasaki, Japan (GRID:grid.174567.6) (ISNI:0000 0000 8902 2273); London School of Hygiene and Tropical Medicine, Department of Population Health, London, UK (GRID:grid.8991.9) (ISNI:0000 0004 0425 469X)
6 Nagasaki University, Department of Pediatric Infectious Diseases, Institute of Tropical Medicine, Nagasaki, Japan (GRID:grid.174567.6) (ISNI:0000 0000 8902 2273)
7 Graduate School of Biomedical Sciences, Nagasaki University, Department of Clinical Tropical Medicine, Institute of Tropical Medicine, Nagasaki, Japan (GRID:grid.174567.6) (ISNI:0000 0000 8902 2273); Nagasaki University, Department of Pediatric Infectious Diseases, Institute of Tropical Medicine, Nagasaki, Japan (GRID:grid.174567.6) (ISNI:0000 0000 8902 2273)