1. Department of Neonatology, Gifu Prefectural General Medical Center
2. Department of Pediatrics, Graduate School of Medicine, Gifu University
3. Department of Pediatrics, Gifu Prefectural General Medical Center
4. Department of Pediatrics, Nagara Medical Center
5. Department of Microbiology, Graduate School of Medicine, Nagoya University
6. Department of Pediatrics, Graduate School of Medicine, Yamaguchi University