Sung Eun Kim 1, Kyungdo Han 2, Won Kyoung Cho 3, Byung-Kyu Suh 4
1Department of Pediatrics, College of Medicine, Incheon St. Mary's Hospital and Catholic University of Korea, Seoul, Republic of Korea.
2Department of Statistics and Actuarial Science, College of Natural Sciences, Soongsil University, Seoul, Republic of Korea.
3Department of Pediatrics, College of Medicine, St. Vincent's Hospital and Catholic University of Korea, Seoul, Republic of Korea.
4Department of Pediatrics, College of Medicine, Seoul St. Mary's Hospital and Catholic University of Korea, Seoul, Republic of Korea.
Corresponding authors: Won Kyoung Cho, and Kyungdo Han