1. Department of Pediatrics and Digestive Disease Center and Research Institute, Soonchunhyang University College of Medicine, Bucheon, Korea
2. Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea
3. Department of Laboratory Medicine, Mokpo Hankook Hospital, Mokpo, Korea
4. Department of Laboratory Medicine and Clinical Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea