1 Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, South Korea. choicw@snu.ac.kr.
2 Department of Pediatrics and Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul, South Korea. choicw@snu.ac.kr.
3 Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, South Korea.
4 Department of Pediatrics and Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul, South Korea.
5 Department of Pediatrics, Duke University Medical Center, Durham, North Carolina, USA.
6 Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA.