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Authors
Yang, Joo Yun
Youn, Young Min
Kang, Jung In
Han, Ye Jin
Lee, Do Kyung
Shim, So-Yeon
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Article History
Received: 18 November 2024
Accepted: 8 October 2025
First Online: 14 November 2025
Declarations
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: The KNN registry received approval from the institutional review board (IRB) at each participating hospital (approval No. SEUMC 2021-02-035). Informed consent was obtained from the parents during enrollment by the Neonatal Intensive Care Units (NICUs) participating in the KNN. All methods were carried out in accordance with the IRB-approved protocol and in compliance with relevant guidelines and regulations.
: The authors declare no competing interests.
