1. Department of Preventive Medicine, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
2. Department of Pediatrics, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
3. Institute for Clinical Research, Mie National Hospital, Mie, Japan
4. Department of Pediatrics, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Republic of Korea