1. Infantile Hepatic Hemangioma Study Group, Department of Pediatric Surgery; Keio University, School of Medicine; National Center for Child Health and Development; Tokyo Japan
2. Department of Radiology; National Center for Child Health and Development; Tokyo Japan
3. Department of Pediatric Oncology; National Center for Child Health and Development; Tokyo Japan
4. Department of Pathology; National Center for Child Health and Development; Tokyo Japan
5. Department of Clinical Research Center; National Center for Child Health and Development; Tokyo Japan