1. Departments of Neurology, UCLA School of Medicine, Los Angeles, California, U.S.A.
2. Departments of Pediatrics, UCLA School of Medicine, Los Angeles, California, U.S.A.
3. Departments of Brain Research Institute, UCLA School of Medicine, Los Angeles, California, U.S.A.
4. Division of Nuclear Medicine and Biophysics and Laboratory of Nuclear Medicine (DOE), UCLA School of Medicine, Los Angeles, California, U.S.A.
5. Departments of Mental Retardation Research Center, UCLA School of Medicine, Los Angeles, California, U.S.A.
6. Division of Neurosurgery, UCLA School of Medicine, Los Angeles, California, U.S.A.
7. Departments of Psychiatry and Biobehavioral Sciences, UCLA School of Medicine, Los Angeles, California, U.S.A.
8. Departments of Anatomy and Cell Biology, UCLA School of Medicine, Los Angeles, California, U.S.A.
9. Department of Pediatrics, Dongshan Hospital, Guangzhou, Peoples' Republic of China