Critical period of oxygen supplementation and invasive ventilation: implications for severe retinopathy of prematurity by Ho Jung Choi, Baek Sup Shin, Seung Han Shin, Ee-Kyung Kim, Han-Suk Kim

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Trend of fetal echocardiography use and comparison of medical costs for congenital heart disease treatment based on fetal echocardiography use in a Korean single center by Ho-Jung Choi, Mi-Kyoung Song, Sang-Yun Lee, Gi-Beom Kim, Eun-Jung Bae, Joong-Shin Park, Jong-Kwan Jun, Hye-Won Kwon, Hong-Gook Lim, Woong-Han Kim

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