1. Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
2. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Republic of Korea
3. Department of Pediatrics, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
4. Department of Applied Statistics, Chung-Ang University, Seoul, Republic of Korea
5. Department of Biostatistics, Soonchunhyang University College of Medicine, Seoul, Republic of Korea
6. Department of Pediatrics, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Republic of Korea
7. Department of Pediatrics, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Republic of Korea