1. Department of Pediatrics and Child Health; Kurume University School of Medicine; Kurume Japan
2. Division of Gastroenterology; Hepatology and Nutrition; Cincinnati Children's Hospital Medical Center; Cincinnati OH USA
3. Central Clinical Laboratories; Keio University Hospital; Tokyo Japan
4. Department of Pediatrics; Keio University School of Medicine; Tokyo Japan
5. Institution of Bile Acid; Junshin Clinic; Tokyo Japan
6. Faculty of Pharmaceutical Sciences; Health Sciences University of Hokkaido; Hokkaido Japan