Division of Neonatology, Okayama Medical Center, National Hospital Organization, Okayama, Japan
Kei Tamai
Corresponding author. 1711-1 Tamasu, Kita-ku, Okayama, 701-1192, Japan.; Division of Neonatology, Okayama Medical Center, National Hospital Organization, Okayama, Japan
Akihito Takeuchi
Division of Neonatology, Okayama Medical Center, National Hospital Organization, Okayama, Japan
Misao Kageyama
Division of Neonatology, Okayama Medical Center, National Hospital Organization, Okayama, Japan
Makoto Nakamura
Division of Neonatology, Okayama Medical Center, National Hospital Organization, Okayama, Japan