1. Department of Human Genetics; Yokohama City University Graduate School of Medicine; Yokohama; Japan
2. Genetics Division, Department of Pediatrics, LAC + USC Medical Center, Keck School of Medicine; University of Southern California; Los Angeles; California
3. Department of Mental Retardation and Birth Defect Research; National Institute of Neuroscience, NCNP, Kodaira; Tokyo; Japan
4. Department of Biochemistry; Yokohama City University Graduate School of Medicine; Yokohama; Japan
5. Department of Pediatrics and Child Health; Kurume University School of Medicine; Kurume; Japan
6. Division of Medical Genetics, Department of Pediatrics; Children's Hospital Los Angeles; Los Angeles; California
7. Division of Metabolic Disorders; CHOC Children's; Orange; California