1. Department of Pediatric Cardiology Aichi Children's Health and Medical Center Aichi Japan
2. Department of Pediatrics Fujita Health University Aichi Japan
3. Department of Health Services Research Graduate School of Medicine The University of Tokyo Tokyo Japan
4. Department of Clinical Epidemiology and Health Economics School of Public Health The University of Tokyo Tokyo Japan
5. Department of Health Policy and Informatics Tokyo Medical and Dental University Graduate School of Medicine Tokyo Japan