1. Department of Pediatrics; Japanese Red Cross Wakayama Medical Center; Wakayama Japan
2. Department of Infectious Diseases; Japanese Red Cross Wakayama Medical Center; Wakayama Japan
3. Clinical Research Center; National Hospital Organization Kinki-chuo Chest Medical Center; Osaka Japan
4. Nagasaki University Graduate School of Biomedical Science; Nagasaki Japan
5. Department of International Health, Institute of Tropical Medicine; Nagasaki University; Nagasaki Japan
6. Department of Pediatrics, Kyoto University Graduate School of Medicine; Kyoto University; Kyoto Japan