1. Departments of Pediatrics, Gyeongsang National University College of Medicine, Chinju, Korea,
2. Microbiology, Gyeongsang National University College of Medicine, Chinju, Korea,
3. Division of Cancer Research, Korea National Institute of Health, Seoul, Korea,
4. Pathology, Gyeongsang National University College of Medicine, Chinju, Korea,
5. Department of Pediatrics, Faculty of Medicine, Kyushu University, Fukuoka, Japan