About Ito Masato
About Department of Pediatrics, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan
About Ito Masato
About Department of Pediatrics, Akita University School of Medicine, Akita City, Akita, Japan
About Tamura Masanori
About Department of Pediatrics, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan
About Namba Fumihiko
About Department of Pediatrics, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan
About the Neonatal Research Network of Japan
About Pediatrics International (Web)
About extremely low birth weight infant
About Bronchopulmonary Dysplasia
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About bronchopulmonary dysplasia
About necrotizing enterocolitis
About outcome
About sex
About very low-birthweight infant
About Epidemiology
About Gynecologic and obstetrical diseases
About 早産児
About 罹患率
About 死亡率
About 性別