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Authors
Ryu, Jae Hui
Shin, Seung Han
Shin, Baek Sup
Kim, Ee-Kyung
Kim, Han-Suk
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Article History
Received: 29 October 2024
Revised: 3 April 2025
Accepted: 12 April 2025
First Online: 7 June 2025
Competing interests
: The authors declare no competing interests.
: The KNN registry was approved by the institutional review board of each participating hospital, and informed consent was obtained from the parents of each infant upon enrollment in the NICUs participating in the KNN. All the participants signed an informed consent form. This study was performed in line with the principles of the Declaration of Helsinki. The Institutional Review Board of Seoul National University Hospital exempted this study from review, as the nature of the study involved the use of de-identified registered data (IRB No. 2303-012-1409).
