Variations in survival outcomes of infants born at 22–23 weeks’ gestation by neonatal intensive care quality level in Korea

G Ga Won Jeon M Minkyung Oh M Myung Hee Lee Y Yun Sil Chang D Dong Woo Son S Soon Min Lee J Jae Won Shim J Jae Woo Lim Y Yong Sung Choi B Byung Min Choi E Eun Hee Lee M Myo Jing Kim C Chang Won Choi E Ee Kyung Kim B Byong Sop Lee M Moon Sung Park S Shin Yun Byun K Ki Won Oh S Su Hyun Koo G Gyu Hong Shim M Mi Lim Chung J Jin Kyu Kim M Min Seon Choi H Hyun Kyung Park J Ju Young Lee Y Young-Ah Youn S Sung- Hoon Chung H Hye Won Park J Ji Sook Park J Jae Hyun Park (School of Aerospace Engineering) Y Yoo Rha Hong J Ji- Eun Jeong J Jin A Lee K Kyung Hee Park Y Young Don Kim M Min Soo Park M Mi Hyeon Gang J Ji Hyun Jeon C Cheong Jun Moon S Sae Yun Kim H Hyun Seung Lee D Do-Hyun Kim S Sung Shin Kim J Jun Hwan Song E Eun Ae Park J Jong Hee Hwang Y Yoon Joo Kim E Eunsun Lee J Jisook Kim Y Yea- Seul Han H Hyun Seung Jin E Eui Kyung Choi W Woo Ryoung Lee Y Yeong Myong Yoo E Eun Woo Nam E Eun Song Song S Saic Kim W Woo sun Song S Shin Ae Yoon H Hye-Rim Kim E Eun Sil Lee B Byoung Kook Lee N Na Mi Lee