1. Department of Pediatrics Children’s Medical Center Matsudo City General Hospital Matsudo Chiba Japan
2. Department of Pediatrics National Hospital Organization Saitama Hospital Wako Saitama Japan
3. Institute for Global Health Policy Research Bureau of International Health Cooperation National Center for Global Health and Medicine Tokyo Japan
4. Diabetes and Metabolism Information Center Research Institute National Center for Global Health and Medicine Tokyo Japan
5. Department of Health Services Research Faculty of Medicine University of Tsukuba Tsukuba Ibaraki Japan