Division of Neonatology, Department of Pediatrics, Saitama City Hospital, Saitama, Saitama, Japan; Corresponding author. Division of Neonatology, Department of Pediatrics, Saitama City Hospital, 2460 Mimuro, Midori-ku, Saitama City Saitama, 336-8522, Japan.
Yohei Matsuzaki
Department of Pediatrics, Yokohama Municipal Citizen's Hospital, Yokohama, Kanagawa, Japan
