1. Department of Mental Retardation and Birth Defect Research; National Institute of Neuroscience; National Center of Neurology and Psychiatry; Kodaira Tokyo Japan
2. Department of Pediatrics; Shimane University; Izumo Shimane Japan
3. Department of Child Neurology; National Center Hospital; National Center of Neurology and Psychiatry; Kodaira Tokyo Japan
4. Department of Pediatrics; St. Marianna University School of Medicine; Kawasaki Kanagawa Japan
5. Department of Clinical Chemistry and Laboratory Medicine; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan