Is there a role for cohort studies after the publications of high-quality large RCTs on the association between erythropoietin and retinopathy of prematurity?
1 Division of Neonatology, National Center for Child Health and Development, Tokyo, Japan.
2 Department of Pediatrics, Graduate School of Medicine, Yokohama City University, Yokohama, Kanagawa, Japan.
3 Division of Neonatology, Nagano Children's Hospital, Nagano, Japan.
4 Research and Development Center for New Medical Frontiers, Division of Neonatal Intensive Care Medicine, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan.
5 Department of Neonatal Medicine, Osaka Women's and Children's Hospital, Osaka, Japan.
6 Department of Pediatrics, Kyorin University, Tokyo, Japan.
7 Division of Neonatology, National Center for Child Health and Development, Tokyo, Japan. isayama-t@ncchd.go.jp.
8 Department of Pediatrics, Graduate School of Medicine, Yokohama City University, Yokohama, Kanagawa, Japan. isayama-t@ncchd.go.jp.