Fig. 1. Flow chart of the study design for patient enrollment.
BW = birth weight, KNN = Korean Neonatal Network, GA = gestational age.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.