aDepartment of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea.
bDepartment of Pediatrics, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.
cPediatric Clinical Neuroscience Center, Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Korea.
dDepartment of Biomedical Sciences, College of Medicine, Seoul National University, Seoul, Korea.
eDepartment of Pediatrics, SMG-SNU Boramae Medical Center, Seoul, Korea.
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