1. Department of Pediatrics Chiba University Graduate School of Medicine Chiba Japan
2. Division of Medical Genetics National Center for Child Health and Development Tokyo Japan
3. Division of Child Neurology Chiba Children's Hospital Chiba Japan
4. Department of Pediatrics Kimitsu Chuo Hospital Chiba Japan
5. Research Center for Child Mental Development Chiba University Chiba Japan
6. Department of Medical Genetics Tohoku University School of Medicine Sendai Japan
7. Center for Preventive Medical Sciences Chiba University Chiba Japan